Mark_A - 1:11 pm on Jul 5, 2010 (gmt 0)

What were the terms of problemusers ban? was it already a permaban, if so nothing to worry about, just keep on keeping problemuser out when he tries to get back in.

If it was a months ban you may have to let him back in but then monitor him carefully and if / when he steps over the line again, which it sounds like he will then ban him permanently.