Unfortunately, the CodeChef domain expired over the weekend which triggered a few internal issues on our end. All of this has been fixed now but if anyone is still facing errors of any kind, do let us know.
To make up for the time lost we are extending the May 2010 Contest by 24 hours. It will now end on 12th May 2010 at 15:00 hrs IST.
Apologies for the inconvenience caused and all the best for the rest of the competition!