@JPDemers Thanks for sharing your experience on this. I'm on a later Dropbox version than the one you reported, and I'm still seeing this issue, so I don't think Dropbox did anything to fix it. It might just be a rare bug. Did you find any way to backup the session windows for Finder? From what I can tell, Finder saves its state in the "Saved Application State" folder, but this folder is not backed up by Time Machine, so I can't use it to get back the lost window tabs.