Maybe pull up "xev" in a console and double check what they keys output is?
This is what shows up on my board:
KeyPress event, serial 32, synthetic NO, window 0x4400001,
root 0x29d, subw 0x0, time 9710021, (342,453), root:(4824,474),
state 0x10, keycode 118 (keysym 0xff63, Insert), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 32, synthetic NO, window 0x4400001,
root 0x29d, subw 0x0, time 9710125, (342,453), root:(4824,474),
state 0x10, keycode 118 (keysym 0xff63, Insert), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
The important part is the "Insert" in parentheses. If that part is blank you might look at the keycode to figure out what its doing. If nothing shows up at all then I'm not sure whats up (something with the board).