BINGO!

That was it indeed. I had actually tried it myself before I posted and missed the amount area too. I'm guessing since you knew right away what the problem was that this is a common mistake. I'm thinking that filling out an amount isn't the most logical setup, or maybe it's that where not used to having an option like that. Perhaps it would be best to have it set at default to use the entire amount, and then there could be an extra option if you wanted to change the amount to use. Just a thought.

Thanks again for your help.