We've just upgraded our 25 users from CC 2014 to CC 2015. We might as well, since we're paying our monthly fees :-)
The issue is, that every time someone opens a file created in CC 2014 (we have literally THOUSANDS!) and makes some changes, it will save in a random folder (could be a OneDrive-folder, random folder on our shares or w/e). Please tell me there's a way to fix that.
If not, I'm going to have 25 angry users screaming at me, since their files are missing.