How weird. Well, you've done more troubleshooting than most. I'm not sure what else to check for at this point. You may want to contact CoffeeCup directly about this if you don't get any resolution in the forums (primarily user-to-user help). There's a few options of getting a hold of them on the contact page:
http://www.coffeecup.com/contact/
I'll post back if I find anything out that might be helpful.