

I finally fixed it by removing all traces of Dropbox (via App Cleaner and Uninstaller), renaming the old Dropbox dir to Dropbox.OLD (I can't seem to delete it, though I reckon I'll be able to with the right admin voodoo) and reinstalling the latest beta manually and downloading all my files anew - FTR, once again Dropbox insisted on using ~/Library/CloudStorage/Dropbox without giving me an option. I won't go into a lot of detail but among a number of issues was that the new version moved my Dropbox directory from ~/Documents to ~/Library/CloudStorage with absolutely no notice and no choice to override it and this apparently caused the sync to hang completely, stuck at 1254 files unsync'd.

Consequently, I was informed within the app of the availability of a new beta, and I opted for the upgrade. So I had been running a beta for Apple Silicon that I'd installed myself from the beta site and it was working just fine but I also then opted in for early releases.
