Hi,
What modchip are you using?
If it's an Xtender, Xecuter 1, or Enigmah modchip, or any early modchips similar to those, then you need to patch the media flag in the xbe. You can do this with XBEMIDP2.
I was only just reminded about this, but future versions i'll patch it before releasing it.
If you have a new modchip, but don't have the version of the X2 bios that automatically patches it, then you can upgrade your bios to the latest X2 - 4977, or patch the xbe, as said above.
Smuggl0r