UBB.threads PHP Forum Software Community Forums UBB.threads 7 Installation and Upgrade Support New installation, import, then Group Management error

I have installed 7.2.1, did an import from 6.7.3, and then during configuration, I get a blank screen on Group Management.

It's not blank as in totally blank, but rather more like a blank lined piece of paper as it has a bunch of lines on each of the pages (Group Editor/Group Access).

I turned on script debugging and the error displayed "A Runtime Error has occurred. Do you wish to Debug? Line: 27 Error: 'total_tabs' is undefined".

Any assistance appreciated!

Thanks,
Tim