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I am on my family's 2012 21.5" iMac (Intel i5, 8GB RAM, OS X Yosemite 10.10.5), and I just started getting these messages yesterday when I opened some applications. We do have apps on our computer from different Apple ID's, but I've been able to use all of them without any problems no matter who was currently signed in, until today. I literally have to log out of one account and into another just to play one of my games, and then I have to sign out and log back in to the other Apple ID if my other family members want to use their applications. It is so annoying, and I only came across this today. I tried clearing caches, rebooting the computer, verifying and repairing the disk and disk permissions, all to no avail. I don't want to delete and reinstall my applications, but if I do have to, could I drag the folders out of the application, reinstall it, and replace the new folders with the ones I already have to restore my app data?? Or worse, would I have to wipe and restore our computer (which contains almost 400 GB of data at the moment)??
iMac, OS X Yosemite (10.10.5)