I realise what the problem was now!.. because of the bank holidays last weekend I'd set the competition not to update on fridays and monday.
Sorry about that folks, I completely forgot to switch it back for these dates. No problem with the price feed then. I'll leave the trades to go through on Monday, unless enough people want to cancel them then I'll delete all outstanding trades.
Unfortunately I wan't around much on Friday, so didn't get a chance to try and find out what the problem was then.
Paul.