Graphics glitch

Anyone have any idea what could have caused this?

https://img210.imageshack.us/img210/...rob13ni9ib.jpg

Those corners used to be rounded off, but suddenly they are square like this. I would assume it would be alphas, but can't realize what the exact culprit is. The only thing is that this problem appears on one computer, but not on another, which has the exact same data. So thoughts turn to graphic cards, but why in the world would it show up like this?

alpha channels in the button texture... don't know where it's located though

Looks like it must be stratpage_03.tga that was compromised somehow. Will try to take care of it. Thanks though Scion. ~:)