I just tried to view my family tree on a Motorola Xoom which has Android 3.0 currently. It opened with the Mordern view by default, but moving the screen was extremely slow and practically unuseable. It doesn't allow me to go to the bottom of the screen so I can select the Classic view. I don't know whether this is due to the version of Flash I have (10.2) or the OS. I am still wating for the 3.1 upgrade.
A workaround to get to the Modern view is to append ?treeMode=immersive to the url. This gives a more useable view although moving the screen up is jaggy and doesn't work most of the time (the bottom row is half hidden). Options->Max doesn't work by the way, even on my Windows 7 notebook running Chrome.
If anybody has Android 3.1, can you confirm that this issue is solved.