I was working with the free version. The workaround that we did was use one of your other PayPal plugins (PayPal Buy Now Button) and simplified. One Button for each item. There were only three items so it was doable (no shopping cart). Thanks for your help Scott! I will change my vote.
I tried sending the form leaving the price code area blank. It worked. I will rewrite the form with the radio button. Will let you know how it goes.
I am still having problems with this same message. I am working with a radio button as shown in the documentation at wpplugin.org. I try to save the radio button in the price code. Am I limited to hardcoding one price on a 3 button code? Thanks!