This may be way too obvious, but you don't actually say that you selected "Group2 U" as the active MIDI map. Can you confirm ?
If the MIDImap is selected, go back to the factory MIDImap and see if you can get any programs to load.
If you can't, make sure MIDI is "enabled" on SETUP/MIDI and temporarily set omni mode "on" to rule out channel setting issues.
If this fails, check your cables and other hardware, also make sure that the BUSY light flashes when you send MIDI to the unit.
