How to Repair Photos Library to Fix Common Issues with Photos App on Mac OS X
The Mac Photos app works well for most users, but occasionally a variety of hiccups can be encountered when interacting with photo libraries, ranging from crashes, to hanging on Photos app launch, a failed import, thumbnails missing from an image library, pictures missing from a library that was imported, or even a completely empty Photos app on launch despite having the proper photo library selected in the Photos app.
If you encounter any of these library management and photo library viewing issues, you can manually trigger a repair of any photo library, which will often resolve the problem being experienced.








If you’ve ever hit “Send” on an iMessage or text message that you wish you could take back, or perhaps you’d just like to cancel a sent picture because it’s stuck on ‘Sending’ and taking forever to send the message due to a congested network connection, then you may find this iPhone “cancel send” trick to be handy. 
iPhone and iPad users can opt to use a new “Filter Unknown Senders” feature in the iOS messaging app which will automatically hush and separate inbound messages that are coming from unrecognized contacts. This is extremely useful if your phone number is publicly listed on a web site like Craigslist, if you’re a public figure, or if you just happen to get a notable amount of inbound messages from numbers you don’t recognize. 