I had wondered if it was a browser issue....
So I signed onto your board and looked.
It's as iff the whole graemlin thing doesn't show up.
Here's an idea. Make sure the ubbt_instant_ubbcode.tmpl file is "readable". Sometimes a file can get set so it's not readable and it causes trouble. Might explain it not showing up at all.
Although I think your Instant markup was there wasn't it.
"Happiness comes through doors you didn't even know you left open. "