Now Dropbox has devolved into starting up and shutting down.
The system tray icon is gone. But the process is still running in the background (both Dropbox and Dropbox Update).
Procmon shows a bunch of activity, with the operations CreateFile, CloseFile, QueryStandardInformationFile, etc... but I no longer get the systray icon and can no longer tell if INDEXING is happening or not.
By the way, before this happened I was down to 0.6 million files left to index, so it progressed faster than the initial slow pace indicated.
And before you ask, no, I don't have any sort of firewall, antivirus, or anything else. I've been a Dropbox user for over 2 decades at this point and this is the first time I'm having these sorts of problems.
Any help appreciated.
(I tried Dropbox support via email, but it's been radio silent.)