I attempted to upgrade to 2.2.3 via the 2.2.2 - 2.2.3 patch.

I uploaded the files to the server then when I logged in to update the system I got a blank page at user.php

I tried accessing admin.php but it said I wasn't logged in. So, I used recovery.php to login to admin and updated the system but still got a blank page whenever I tried to login. I don't know what the problem is though I noticed in the comments for the patch that this has happened to a few others (should of read that first). I downgraded back to 2.2.2 for the time being.

If you need any further info I would be glad to provide it.