Yesterday, I noticed that Dropbox was no longer connected on my laptop running Windows 11. There is no system tray icon for Dropbox, and clicking on the start menu app icon does nothing at all; same for "Open Dropbox" on the website. I've uninstalled, reinstalled, rebooted multiple times, tried different firewall settings, redownloaded the installer, but no luck with anything. A previous thread discusses a similar problem, but no solution:
https://www.dropboxforum.com/t5/Apps-and-Installations/Windows-11-Upgrade-and-cannot-get-Dlox-to-work-properly/td-p/566989