Nothing can explain better then fiddle: www.jsfiddle.net/Dt2TE/15/
Compare with where their isn't any multie page view. www.jsfiddle.net/Dt2TE/9/ There is some JS that doesn't get properly loaded into the other page (#two).
jQuery mobile needs to initialized before webshims, otherwise you get exactly this result. As I wrote the jQm compatibility things, I wasn't aware, that jQM can have multiple pages in one document and only enhances one of them.
I needed to change some parts in polyfiller to support this. Here are the changes: https://github.com/aFarkas/webshim/commit/03b425a2258a8c168c165dbde58ec3a09ae76433
A working example can be seen here: http://afarkas.github.io/webshim/demos/demos/webforms/jquery-mobile.html
And here an updated fiddle: http://jsfiddle.net/trixta/Dt2TE/31/
//jQM: set waitReady to false
webshims.setOptions('waitReady', false);
//jQM: set wsdoc to active page or false
webshims.setOptions('wsdoc', $('.ui-page-active').updatePolyfill().get(0) || false);
//jQM: update polyfills on pageinit and change active page
$(document).on('pageinit', function(e){
webshims.setOptions('wsdoc', e.target);
$(e.target).updatePolyfill();
});