Zoho Creator Mobile Access

I'm trying to access Zoho Creator on my iPod Touch (ios4). When I go to http://creator.zoho.com/mobile, I'm prompted for my logon information. After entering it, and clicking "Sign in", everything just stops working and I'm never able to get logged in.

Is there a problem using Zoho Creator Mobile on an iPhone running ios4?

Thank you for your assistance or suggestions.