Cannot upload to challenge
I was in the same boat and played for ages trying to solve what I thought was a problem with my computer, the extreme gale force winds outside, or else my ISP. Eventually I contacted Simon who responded quickly and told me it was a bug at DPR that they were fixing and the problem was quickly resolved. I am very impressed with Simon getting back to me personally when I know how busy he must be running this big site. The engineers are no slouches either to locate and fix the problem so speedily. So thanks to all of you - cigars all round!