I always have this problem EVERY TIME when i deleted some member from control panel. After i delete, I rebuild forum, rebuild member stats file, rebuild search ( i mean rebuild ALL) and it will give me something like this:

No member profile found for member number: '00002993'
(Backtrace: : ubb_lib_files.cgi:834 -> sub main::Tracer)
(Backtrace: : public_pntf_summary.pl:893 -> sub main::OpenProfile)
(Backtrace: : ubb_lib.cgi:1901 -> sub main::QuickSummary)
(Backtrace: : ubb_lib.cgi:1809 -> sub main::FilterPNTF)
(Backtrace: : ubb_forum_summary.cgi:14 -> sub main::ServeFromCache)
(Backtrace: : ultimatebb.cgi:518 -> sub main::forum_summary)

» Please use your browser's back button to return.

So i have to upload a fake file to match with the member i just delete then it ok. So frustrate if i delete a large number of members. Can some one tell me what is wrong with it?

I had that same problem when I deleted a member but that was a while ago, on a 6.2.0 I think.