Bottom question in the FAQ. It will be fixed in next firmware by providing an option in settings to toggle it on/off.
I think Himedia didn't realise it's such a problem because it's not a problem using just remote, not mouse. So some users won't have noticed it at all.
* Stop navigation bar from popping up when mouse cursor at bottom of screen (firmware 3.0.2 only, Q5/Q10/M3) Install this update file: http://www.mediafire.com/download/c4gb03d2p3suc67/update.zip To install copy file to USB stick and go Settings - Upgrade - Local upgrade. It will only remove the navigation bar and make no other changes to your setup.