I am having the exact same issue on my site. I've done a temporary fix by clicking "display full site to first time visitors" which at least gives me the menu functionality back on my Nexus S phone which is running the latest android operating system. Mobile version looks fine/useable on my Nook Color tablet. I added the Nexus and Galaxy agents to the custom agents field.
When I don't have "display full site to first time visitors" clicked, I have the exact same issue as Mattoid above--white background w/ icon with "Home" and no functionality/menu/clickability.
If I could be sure that upgrading to Pro would solve the issue w/ android compatibility, I'd be willing to do it as I'd like to tinker with the look a bit beyond what the free version is letting me do (only have grey background versions is depressing as is having the page titles displayed :))