jQuery 1.9.1 is "incompatible" with jQuery Mobile 1.2.0. Loading jQM 1.2.0 errors out with jQ 1.9.1. I'm basing this off a very simple test of resizing the browser window to suit the mobile viewport size (a refresh may be required). The app fails to display the jQM styles on my Android as well, for a realistic test. As a tip, you could use the HTML5-Mobile kitchen sink app to establish expected behavior, like so: http://imgur.com/26MXqAd

For reference: the supported jQuery versions (> 1.6, <= 1.8.2) for jQM 1.2.0 is documented at http://jquerymobile.com/blog/2012/10/02/announcing-jquery-mobile-1-2-0-final/ and for jQM 1.3.0 at http://jquerymobile.com/blog/2013/02/20/jquery-mobile-1-3-0-released/

If we do bump up the version of jQ+jQM, then, in my opinion, we should do this for all kitchensink apps.

Note - The mobile styles are applied when I downgrade jQuery to 1.8.2, or upgrade jQM to 1.3.0. So it's just a matter of deciding a downgrade or an upgrade and running/writing additional visual consistency tests.