Hi.
The same thing happened to me. I softmodded my Xbox with Rocky5's Xbox-Softmodding-Tool v. 1.1.8 and then I installed XBMC4Gamers 1.3.000 dashboard along with MS Dash 5960. The HDD Key is nulled with all 1s and I'm not using the original Xbox drive. Doing Rocky5's trick with "hdd-key.txt" file worked and now XBMC4Gamers gives no error any more when I install DLCs. I tried Amped 2 and RalliSport Challenge 2 DLCs and they work fine. But Project Gotham Racing 2 DLC does not show into the game, though I can see the new gamesaves in the MS Dash. For Dead Or Alive 3 DLC, instead, I don't see any gamesave at all.
Am I doing something wrong or are there issues with the all 1s key (which is the default key) or XBMC4Gamers? I tried launching PGR 2 with UnleashX also but nothing changes.
Thanks for any reply!