I upgraded from v3 MAS to v4 MAS this morning, according to the process outlined. I have my datafile in DropBox. So what I have is v4 App with all fields and data. The Menubar app, when I go to a login website, shows the saved site name. The new browser extension also shows the website name, but does not fill in the details. Tried this multiple sites.
I've trashed and reinstalled extension. I've trashed and reinstalled the app from MAS. The result is still the same. All three picked up the 'dummy login' item, too, so the info is getting through, but still the extension won't input anything. I'm at a loss here...!