Weird, I had the same problem using vanilla $200 GC (purchased at OD) to load BB at WMT.
IIRC, the swipe failed with transaction error: 51.

Later, I checked the balance to be $200. I have bought bunch of these at OD and loaded them to BB/GB at WMT. I thought it was some fluke or the clerk not keying something properly.

I am going to try again tomorrow..

lovenala.. whats up? trying postcount++?