To add my voice to the chorus, I have also had problems with PayPal through the years. Based on the amount necessary for the final payment due by the end of July, I fully expect the size of the payment to cause at least a "hiccup" when I try to put the payment through.

Considering the huge volume that this DO is going to generate, maybe a credit card payments online shopping cart could be set up to take payments? I am not bringing this up to cause problems, so I withdraw my suggestion in advance if SMDO II organizers or participants object or are offended by this suggestion.