Thanks for the link! Deleting my Dropbox authentication and authenticating again solved the problem.
Hi @card-one-concepts,
Got the same problem and I used the cPanel file manager to delete dbcache.log. It didn’t break anything. W3TC recreates the LOG-file and continues to fill it endlessly. In the same folder, I found two more files, cdn.log and minify.log. You might find them too. Deleting them didn’t cause any damage either.
This is a real issue and I plan to get rid of W3TC asap.