Hi, I am the colleague of Kathygraphy - and found a solution.
1. Quit all adobe apps.
2. Sign out from creative cloud
3. Quit creative cloud
4. In Activity monitor force quit all adobe and creative cloud processes
5. Go to users/username/application support/Adobe and remove the folders CoreSync and OOBE (or, better: make a copy as a backup and remove them. But in my experience from the past, I have never had to access these copies again).
6. Restart computer (don't know if this is really needed, but might as well do it at this stage)
7. Launch Creative Cloud app, in case this doesn't happen automatically
8. Sign in
9. When syncing starts: pause it, because Creative Cloud starts a new creative cloud folder and moved the old ones to an archive folder. Since we have a lot of files to sycn - as in really a lot - you don't want to download these again, and keep them double on your disk.
10. Browse to the creative cloud folder. In the same location you can see something like "Creative Cloud files (1)" or "Creative Cloud files (archived) (1)". This folder contains your original files. Move them to the newest "Creative Cloud files".
TIP: if you don't see the the archived folder, it might be hidden. In OSX: press cmd+shift+. (period) to show hidden files.
11. Go to creative cloud app, and hit to play button to continue syncing. This might go through all your files again and take a while, but not so long as re-downloading everything.
Did this procedure on 4 computers so far, and it fixed them all.
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