My player is currently fsck'ing and it looks to be a while, so I can't test it myself, but don't you need to list mappings in "most specific" order? Ie .LTC before .LC because LC matches a long press in any source, including tuner... I haven't played much with the IR translations yet, but I think I've seen this mentioned on the board... OK, here Edit: oops, should read it better before posting... not what I was thinking about.

If the symptom is that you can go from player to tuner with a long press, but not back, then I'd guess this is it. But if nothing works for the bottom button (for instance select/enter in the menus then something other is wrong.

/Michael