It's not an answer ! But I share the same problem with Adobe Shape and Adobe Shape on my iPhone. And Creative Clouds' Desktop App.
First. When I updated Shape and Color on my iPhone 6, Libraries disappeared. But remained on my Apple Macbook laptop in CC 2015 Tools and Apps.
But NOW I cannot synchronize last graphic essays made with my iPhone in Illustrator for example ? And I'm a bit afraid that a solution erse my Laptop Library's items ?
Need perhaps An Adobe qualified answer ?
Same. I tried reinstalling just in case, no help.
Help us out Adobe!
I still have this problem and can't download assets from marketplace either now.. c'mon Adobe help us out here!
have you tried to reinstall the CC manager? Or log ut, shut down, start again and log in again? Would you try?
At times this might depend on a slow internet connection that breaks the syncing