My PC was acting up and I made a new user account to see if that would help. In that account, I tried to reinstall dropbox, and point it to the original dropbox location ("User1"). Dropbox said there was no room, suggested synching only a few folders, and that all others would be online. I picked a few folders to sync.
Dropbox then appears to have deleted everything from many folders. I noticed that going on and rebooted back into the problem account "User1." many folders are emptied and their files do not show up online under 'Deleted files'
Any help MUCH appreciated.