"Computer is no longer authorized" even though when I authorize it, it says it's ALREADY authorized

I'm trying to sync my iPhone with my computer. It says, though that my computer is "no longer authorized for purchased items that are on this iPhone." So I go to Store->authorize, and then it says "this computer is already authorized." (see screenshots for details). But when I try to sync again, it says (again) that it's not authorized.
I've tried:
-deauthorizing all computers, and re-authorizing the one I want to use
-removing the SC Info folder
-logging out and back into iTunes
I'd appreciate any feedback or help.
I'm using the most up-to-date OSX Yosemite 10.10.2, with most up-to-date iTunes (12.1.0.50), and my phone is an iPhone 5s with iOS8.1.3.

Hey CarlyR_,
Thanks for the question. I understand you are experiencing issues related to iTunes Store authorization. The following resources may help to resolve these issues:
iTunes repeatedly prompts to authorize computer to play iTunes Store purchases
http://support.apple.com/kb/TS1389
iTunes: Missing folder or incorrect permissions may prevent authorization
http://support.apple.com/kb/TS1277
Thanks,
Matt M.

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