now its not a perfect fix but if you change the ChatFrameFilter function in the core.lua file at line 180 to:
function SpamMeNot.ChatFrameFilter(self, event, ...) return SpamMeNot.filter:FilterEvent(event, ...), ... end
It should stop it filtering everything. sadly (!) i havent found any gold sellers so i cant tell if it still blocks them yet, bit it seems ok so far.
Hope this helps someone