Interesting call, Mastermind.
Moved the board last week to our upgraded server. Then, just had our UBB5 upgraded to UBB6.05 today by Infopop installer.
Checked what you've mentioned and a few more things, but all seem to be set right.
I'm at a loss. I must be overlooking something…programs don't lie <img src="https://www.ubbcentral.com/boards/images/graemlins/confused.gif" alt="" />