I think
the previous poster was right: the value of $userinfo['posts'] is not coming thru properly ... this is formatted using vb_number_format earlier in the member.ph file, so the value of $userinfo['posts'] is in fact a string now - not a number.
We're almost there: $userinfo gains it's values on (unedited) line 184 ... we just need to reverse the effect of vb_number_format on the value of $userinfo['posts'] ...