Wow the same thing happened to me yesterday,
I PMed Bitinstant(Yankee) and he fixed the problem within hours. The problem was it got stuck in the fraud filter.
I thought I was scammed when I didn't receive my funds. This was a relief. Due to the fast customer support through this forum(not the website) , I might go today and purchase another $500 through bitinstant .
THANKS ALOT YANKEE AND BITINSTANT!!