jQueryMobile Header Rendering / Background failed while Page Transition

jQueryMobile Header Rendering / Background failed while Page Transition

im just working with JQM 1.4.3 / 1.4.4. With Chrome, Firefox and so on it all works fine (Desktops) - but if i "emulate" a mobile phone with Chrome Developer Tools or try the site on a real mobile the fixed header of my Site fails to render WHILE Page-Transition is going on.

I googled so long but the generally known "Flickering Issues" - Solves didnt clear my Problem.

To make it more visible to you there are 2 Screenshots - the first one shows the Page-Header as it should be. The second One shows what happens if you initiate a Page-Transition.

Look at the blue borders around the Nav-Button & Back Button and the White Background on the next Site. If Transition is over the Header gets rendered correctly.

(the "blue border" on bottom is the Beginning of a Picture thats not the problem!)

Can anybody help me please?

Thanks & Regards
Rene

1.) http://i.stack.imgur.com/7ZOMm.jpg
2.) http://i.stack.imgur.com/EX8zX.jpg