does anyonhave issues processing a Master Card debit? Visa Debit works no problem.

The only thing that we have issues with is credit unit debit cards.  We can't put in the CVV2 code or it will always decline.  It took me a while to figure out that it was always the credit union cards that declined when they shouldn't.  I don't even remember how I ended up trying without the code, but now I know to skip that for those cards.