that is the biggest problem.....i do NOT get any error myself. BUT using andreas hack which is letting me see the security tokens issued and where were they issued i am getting emails about it
and ofcourse emails from teh members when they get that error.
so when i go to the thread specified in the email ..i dont see anything unsusal.
so it seems like showthread.php and some times search.php or ajax.php are giving some members that error.
I had this problem too, Don't know why but I never saw the error it was Some of my members. The one Hack that in the end I found causing it was Sid' Hide Hack. If you have that installed, i'd remove it and get the vs Hide Hack Resourection mod. Had no problems since