Over the past few days the server that's hosting ClearCheckbook had been acting up. This morning, it went down for a few hours and we contacted support and tried to find out what the heck was going on. It turns out there were a few factors coming into play, but the end result is that they moved us to a different machine that shouldn't have any of the problems the old one had.
I'm sorry for any problems you've had while trying to access the site. If we continue to experience problems with this company we will start searching for a new server soon.