PHPR 5.2 to 5.3 mobile browser changes?

I have a mobile browser running on code generated on PHPR 5.2. But after upgrading to 5.3, some things no longer work, like some buttons on some forms. The logon button works, but in add record, the save and back to list buttons no longer works. The debugging tools for my mobile browser is not in the same league as Firebug. I'm struggling to understand whats happening, what's different in the code. How to debug. The same code runs ok on a regular browser, so its something to do with being a mobile browser, maybe there's some javascript or css which works differently in the mobile environment, that's somehow changed in 5.3? I dunno. Help <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=16668&image=1&table=forumtopics' class='bbc_emoticon' alt=':)' />