Thanks again Vipermad!
Something indeed is amiss then. I don't have any reference to maxmemfields in my ubb_library.pl!
Wonder how that happened. I don't think I installed a hack that would have overwritten that line. Or did I? Hmmm. I don't think so though, none of the hacks I installed should have deleted a line relating to user profiles. Running UBB 5.45a.
Since the line doesn't currently exist, can anyone tell me where it's supposed to be in ubb_library.pl? Maybe I can just kinda stick it in there and hope for the best.
A thousand thanks.