Installed the new version, same problem (see below). Restarted to close Dropbox, same problem. However, I tried a copy of a folder in \Dropbox using Powershell and it worked OK (copy c:\Users\WMR\Dropbox\Rebecca\*.pdf g:\rebecca\). Is there a Dropbox cache or something that I should clear out in my \Apps folder? I don't want to experiment without knowing which ones to delete.