Ok... it was setup a bit wierd, and had a minimum invoice amount of $10, but a max debit of $60, and since you were below one but not the other it didn't allow you to pay yet (I don't understand that logic either). I think we initially set the minimum payment at $10 to avoid paypal fees for low amounts (where nobody but paypal wins) anyways, reset that to $0, and a $60 max debit... Grant will probably change it again, but thanks for pointing it out, and helping us fix it.