Hi,
Could you provide a test URL that is permanently set to the mobile theme with jquery mobile loaded (so I can test it from a desktop)?
I briefly browsed through the jquery mobile forums and it appears others were having trouble with this as well, for example:
http://forum.jquery.com/topic/google-maps-inside-jquery-mobile
They may have been confusing the Google issue with displaying maps in an initially hidden container, but if you’re a javascript developer, you can try triggering the map resize event like this (assuming the map is named ‘mapp0’ – see the FAQ for some info about map names):
mapp0.resize();