The Dropbox app doesn't start up on macOS Tahoe 26.0.1.

There are major, major issues with Dropbox on MacOS Tahoe, including the latest 26.2. I managed to fix it, albeit temporarily. I think it has to do with poor memory management probably -- Dropbox processes even block the copy/paste clipboard, where I can't copy or paste anything, and I have to quit Dropbox in order to unblock that process.

I suggest Dropbox work very hard with the Apple team for both of you to implement fixes on both your ends. To be honest, this is really making me think about leaving Dropbox and just using iCloud because it doesn't have any of these issues.

I found a temporary solution to Dropbox not syncing (it doesn't resolve the occasional copy/paste issue, but it does appear to resolve syncing) is to exclude the Dropbox folder on local disk from the Spotlight indexing. That appears to alleviate a lot of syncing and blocking issues. 

But it's bad. imo you're going to bleed users until you resolve this matter.