Why don't my comments show up....? (when challenging or requesting a game)

Do you have Mac?

I have a-non-Mac....dont know what to call it. CPU w/pentathlon pro PC. Let's say: like an IBM. ha. I play Painkiller and Massive assault w/no prob.. My machine is no whimp but it could be even stronger.

Oh well. Don't know then what could be wrong. The Mac version has bugs in it's messaging system but I haven't heard similar problems with PC.

I've noticed that there are very few comments along with the challenges. So I dont know if they are also failed attempts.
Are Mac users able to challenge at the game site?
I found at least one challenger HERE but I would have seen the challenge easily, earlier if he had put his challenge at the game site.
If I'm looking for a game RIGHT NOW, I look for the most recent post, so updating the challenge is necessary for desperate gamers.