5
Well the upgrade has worked - sort of. The upgrade instructions didn't seem to work, uploading the contents of htdocs overwrote mainfile.php which meant I had to go through another install process. However, the buttons on the preferences/control panel pane now work.
But user.php yields a blank page and the message received after logging in for the first time after confirming an account says you've already registered. I think I've seen something on this elsewhere on the forum though.
Ho hum, as long as it works eventually.