None of the changes I have made to files in my Dropbox folder in the last 24 hours are syncing across to other users - not even between the two users on the same Windows 10 PC. As both users on the PC and on the iPad, I sign in to DB with e-mail address and password. On my main account, I have unlinked the old PC (which no longer exists). I have had to change the PC recently, so I have re-installed DB on this new PC. I have it installed for two users on the same desktop PC and also on an iPad. I am using Dropbox basic (only 5.2% of space used) on version 53.4.67.