Ok, I went to the site and spent 10 minutes or so jumping around, reading an article or two, and could not duplicate your problem. With that in mind, and no other good ideas, I'm just going to suggest some general stuff that may help.
What iOS version is your iPad running? If you are not jailbroken, and don't intend to go that route, you may want to make sure you are up to date. The current version is iOS 4.3.5. I recommend the Download only options, as it breaks things up, and seems to have a lower failure rate. Not that it's a huge failure rate to begin with, but why take more chances than needed.
Clear the cache again, and the cookies to be on the safe side.
Restart the iPad, if you haven't done so recently. If that does not work, try a reset.
Restart: Hold down the power button until the power off slider appears. Slide it off. When the iPad finishes shutting down, hold down the power button again until the Apple logo appears.
Reset: Hold down the power and home buttons until the Apple logo appears. The iPad will reboot. This usually takes a bit longer than a restart.