<---looks like that one. The big gaping "omg shock-awe noway" smiley.
It shows up in the post box, but once it gets posted (assuming the post shows up in the first place, problem still exists, doh), it just shows the code.
It's the jawdrop.png smiley, and I tried to manually insert the image using the image url and either that's not working as well, or the forums are being really slow and aren't properly updating the edits (leaning towards that one).