Okay well your attachment had an java error
It is like this you are using Vbulletin RC3 which is beta. There will be issues. We address them as we get them but your not making clear your issue here. You say you can't post a comment yet I go to your install and can.
I for the sake of it did another here using IE
http://www.nitro-powered.com/gallery...to.php?photo=7
So I guess the issue is what are you doing differently than I
I have no troubles posting on my site either