Last Friday for no apparent reason my FULLY PAID copy of Game Stock Car 2012 stopped loading. Kept getting error "unkown return code" Tried my serial number but this kept coming up as invalid. It says contact the vendor. Sent Reiza an email Friday morning (Brazil time) and still no answer. I'm part of a GSC racing league and therefore very frustrated that they have not responded to my requests. Is this normal for Reiza or am I just unlucky?