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JQuery Mobile 1.2.0 Beta 1 in combination with JQuery 1.8 or 1.8.1 completely brokes on loading, it gets stuck on loading spinner. If you change JQuery to 1.7.2 or lower it works as it should. Here the Jsbin to demonstrate:
Tested on a BlackBerry 9000 OS v126.96.36.1997
Turns out this this is due to a change in jQuery core that removed a lot of old offset code in favor of getBoundingClientRect:jquery/jquery#726
BB5 and older iOS (pre-4.0) don't support elem.getBoundingClientRect() and are erroring out. We use this for the loader and slider so we'll need to coordinate on a fix with core. Seems to be something we can mitigate on our end by switching how we approach these plugins.
Closing as fixed by commit e356019 and 83bf40c.
BB5 and iOS3 (browsers that don't support getBoundingClientRect) get C grade support when used with jQuery core 1.8.x and up.