Gatekeeper is an application level security feature on the Mac that aims to prevent unauthorized and unidentified apps from being launched in Mac OS X, thereby preventing potential security problems like exploits or trojans from running on a Mac. The feature is most often encountered when an app has been downloaded from the web, and upon attempting to launch the app a warning dialog will prompt the user with a message saying something along the lines of “This app can’t be opened because it is from an unidentified developer“.

We’ve covered how you can get bypass that error message on a case-by-case basis by using the right-click “Open” trick, but the latest version of Mac OS X brings another option which may be easier for some users to selectively launch apps and bypass Gatekeeper. This is advantageous because users can continue to retain the strict security preference of leaving Gatekeeper enabled and intact, which is generally recommended.

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Many users of the Mail app in OS X Mavericks have experienced significant problems, ranging from severe issues like randomly deleting emails to entire inboxes, to not signifying if emails have been read, amongst a wide variety of other more minor but annoying problems with the Mail app. Some of the issues have been so bad or annoying that a fair amount of OS X users had to stop using the Mail app completely, seeking alternative solutions, particularly for Gmail, to work around the bugs. But that is no longer necessary, and if you’re a Mail app user you can comfortably use Gmail and Mail in OS X Mavericks again without having to deal with some of the bugs and quirks that plagued the initial release.

Getting the essential Mail update for Mavericks is done through the App Store:
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With FaceTime Audio, the iPhone can now make free VOIP (Voice Over Internet Protocol) calls directly from the built-in phone or FaceTime app, without the need for any third party services or applications. This basically means you make phone calls to anywhere in the world for free, so long as the recipient of the call is also using an iPhone, iPad, Mac, or iPod touch, and are running a modern version of iOS that supports FaceTime Audio.

The audio call quality of FaceTime Audio is impressively clear and sounds much better than a standard cellular connection anyway, so even if you’re not looking to use this service as a long distance replacement, it can offer a significant improvement to general phone conversations as well.
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Finder Tabs are one of the better Mavericks improvements brought to the Mac OS X Finder in years, letting you use the file system in a single window view, with each open folder or directory path as it’s own unique tab.

Used properly, Finder Tabs will prevent the enormous amounts of window clutter that can occur unintentionally when navigating around the Mac file system and juggling a handful of different windows and locations, but if you find yourself overwhelmed with Finder window overload you can use the excellent Merge feature to gather all windows into a single Finder window with tabs.
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The Settings app for iOS has tons of individual preference toggles, adjustments, tweaks, and customizations, adding up to what is likely hundreds of options. Each of the settings is segmented into a variety of categories, like General, Sounds, Notification Center, Privacy, Location, plus just about every default app, and many third party apps too. While navigating around the Settings app is pretty easy, it can also be confusing sometimes, and it’s easy to forget where some settings are stored, particularly if a setting is buried somewhere and you can’t remember where to find it.

This is when Siri comes in to save the day, because you can now launch directly into any system or app settings just by asking Siri.
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Most iPhone users have trouble-free use of their device whether it’s on a cellular connection or wi-fi, but wireless connectivity issues do occur from time to time. These type of problems can manifest in a variety of ways; sometimes the Wi-Fi on and off toggle switch is grey and unusable (sometimes resolved by simply quitting the Settings app and relaunching), sometimes the iPhone will appear to connect to a wi-fi router but no data will transfer, connection speeds are unusually slow, and other times the iPhone will simply refuse to connect to a wireless network at all.

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Though we generally recommend staying on the latest versions of OS X, some users may find incompatibilities or problems associated with updating their Macs to OS X Mavericks, and for these unique circumstances it can make sense to downgrade the Mac back to a prior release version of OS X. For such specific cases, we’ll cover downgrading from Mavericks (10.9) back to OS X Mountain Lion (10.8). To accomplish a downgrade using this method, you must have made a Time Machine backup made prior to the OS X 10.9 upgrade / install. If you do not have a Time Machine backup prior to OS X 10.9 being installed, this particular walkthrough will not work for you.

Be sure to back up the current volume and all files before attempting the downgrade process, otherwise you may lose the files and data that was created between the original upgrade to Mavericks and this downgrade procedure.

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Do Not Disturb is an excellent feature of iOS that, when turned on, mutes notifications and alerts for all incoming calls, messages, and apps. It’s easy to toggle on and off, providing for some digital peace and quiet with a quick switch. But if you’re actively using an unlocked iPhone, iPad, or iPod touch while Do Not Disturb is on, the alerts, calls, and notifications will still make sounds, which may defeat the purpose of the setting for some users, and can make it appear as if the Do Not Disturb feature is not working at all. That’s what we’ll settle here, insuring that Do Not Disturb remains always silent when it’s set on. Even if the iOS device is actively in use, all phone calls, texts, and alerts will automatically be silenced (unless they’re on the exceptions list, of course). It’s a simple settings adjustment available in new versions of iOS, but one that is often overlooked:
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Changing the login screens background wallpaper is a great way to customize the appearance of a Mac. The process of doing so seems to change with every release of OS X though, and that’s no different with swapping out the login wallpaper in OS X Mavericks. Changed yet again with OS X 10.9, you will find that rather than replacing a single file with a new image, you’ll have to replace four separate files to gain a similar customization of the login window, which is seen both upon system boot and with swapping logins with Fast User Switching.

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The Dock received a significant visual overhaul along with almost everything else in modern iOS versions, and though the days of the OS X look-a-like are gone, you can still customize the coloration and transparency of the Dock a bit. One option is to change the wallpaper, which has a profound effect on the appearance on the Dock along with other user interface elements of iOS, but what if you like your wallpaper and just don’t like the way the Dock looks with it?

That’s what this trick will help, achieved indirectly by using the contrast setting that is intended to improve usability, it removes the sometimes garish hyper color look of the iOS Dock that comes from using certain wallpapers, replacing it with a simple translucent Dock color with much higher contrast, typically a dark color roughly based on the wallpaper. The result is greatly improved readability, and sometimes a much approved appearance of the Dock overall too. Note that there are some other UI changes that will occur with this setting, making it undesirable to some users.
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Dictation is the new speech-to-text engine that lets your Mac type out what you are saying as you talk, and it’s one of the many excellent features included with modern versions of Mac OS X. Now from Mavericks onward, you can improve Dictation considerably by enabling an option called “Enhanced Dictation”, this will provide two significant advancements; continuous dictation with live feedback as you talk, and full offline support – meaning you won’t need a Mac to be connected to the internet in order to use the feature.

If you use Dictation with any regularity this is a highly recommended option to enable, as enhanced dictation is sure to improve your usage of the excellent speech to text feature on the Mac.
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Have a bunch of Notifications and Alerts sitting on the lock screen of your iPhone or iPad that you don’t want on there anymore, but don’t want to unlock the device or leave the lock screen? No sweat, rather than swiping to unlock the iOS device and then manually addressing the notifications, you can shuffle them all away and store them into Notification Center where they belong, immediately clearing off the lock screen without ever leaving it.

This swipe gesture trick is similar to how you can dismiss alerts from anywhere, and it’s super easy to use:
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Already installed OS X Mavericks, but now you want to create an install drive for other computers? Or maybe the Mavericks installer became corrupt during the process? Whatever the situation, you can easily re-download OS X Mavericks from the Mac App Store.
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Java has plenty of real-world applications and uses, but because it has been used as an attack vector in the past, Apple has made OS X reasonably aggressive in limiting Java on Macs. As a result, Mavericks does not come with Java preinstalled, and upgraded Macs will remove Java in Mavericks installation process. For most users this is a very good thing, it further reduces the unlikely event of a trojan or something nefarious being installed on Macs, and many Mac users won’t notice Java missing at all. On the other hand, many of us do need Java installed in OS X.

Many common applications use Java, ranging from the excellent cloud backup service CrashPlan, to the Eclipse IDE, and even some online banking and financial services, and without installing Java yourself in Mavericks you’ll find these apps and websites simply don’t work. Fortunately it’s a simple fix just like in 10.8, and you can go about installing Java on OS X Mavericks in several different ways.
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Swiping down from the very top of your iPhone screen (or iPad), you’ll find Notification Center swoops on down, where alerts, notifications, iMessages, and missed calls appear. There’s also the “Today” tab, which aggregates information from your Calendars, Reminders, Stocks, and destinations, and puts them into an active days summary of what’s on tap for today.

If you want to customize the appearance of Today view, either where things appear in the list as you scroll, or to hide specific items, you can do that directly through iOS settings.
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Network Utility is a great tool that has been around on the Mac since the very first version of Mac OS X. It provides a variety of helpful networking tools and details, the “Info” tab includes general network info on a per interface level showingIP address, MAC address, link speeds, and sent/received data transfer statistics, and you’ll also have easy GUI access to what are otherwise command line tools, like netstat, ping, nslookup, trace route, whois, finger, and a port scanner.

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Sharing files between Macs and NAS drives and Windows PC’s has always been very easy, but Mavericks brought a slight change that has caused some problems for certain users in mixed PC and Mac environments. Without getting too geeky, Apple adjusted the default protocol for SMB (Samba, the Windows file sharing ability) from SMB1 to SMB2, and the SMB2 implementation apparently carries a bug which is incompatible with many NAS (Network Attached Storage) devices, and some versions of Windows. The issue is pretty obvious when you encounter it: Many Windows PC’s, NAS drives, and Linux machines won’t access or mount from the Mac, and instead will try to connect or mount forever and ultimately time out, preventing connections, mapped drives, and general access.

Fortunately there’s a very easy workaround to connect to SMB and NAS shares from OS X Mavericks, OS X Yosemite, and OS X El Capitan:
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App Nap is a great feature that arrived with OS X Mavericks which automatically pauses applications once they have gone unused for a period of time, helping to reduce energy consumption and saving battery life for portable Macs. Though App Nap can make a big difference in extending the battery life of MacBooks, there are some unique situations where users may not want an application to pause itself when unused, inactive, or otherwise in the background. For these situations, you can selectively prevent App Nap by disabling it on a per-application basis. Most users should not disable App Nap without a compelling reason to do so.

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