We frustratingly have not found a way to sync labels between computers, which screws up our shared render files. We can sync materials and everything else without problem because you can choose a relative folder path, but that's not available for labels. Tried syncing them in the texture folder, but that didn't work either. Anyone have a solution?
Are you pointing your library to shared folders?
The library is pointed to a folder in dropbox that syncs.
Can you open the log and see what error message you are getting? The log is located under the Help menu.