I was wondering if you got any resolution for this problem? I have a URC mx890 that is doing the same thing.
Directional button presses actually trigger the On Screen Display buttons, Guide, Info and Menu also trigger the On Screen Display buttons.

I've factory reset the device from the settings menu, even at the factory default demo the key presses trigger the same events.

I've reloaded the file, as well as built a new file anyone able to offer any advice or suggestions?