2.2.1 Upgrade to 2.3 - Blank page
For 2 days I have repeatedly attempted to upgrade a fully functional v2.2.1 to v2.3. Once I got as far as seeing an 'Update Success' page, but then failed to get access to the forum or dashboard. Yes, I followed the troubleshooting instructions and any other guidance I could find here. In desperation I've even attempted a clean install into a new directory, but when I navigated to that folder in my web browser to complete the setup all I saw was a blank screen. Firefox Web Inspector showed the attached code for that page.
I've uploaded my backup of the 2.2.1 vanilla folder to the server and it's active again, fully operational.
Any clues to point me in the right direction please?
Host: 1and1.co.uk, shared hosting