have you got line 6 monkey downloaded ?

You can use it to check the authorization for the model packs you have. The XTL comes with the FX-junkey pack which is probably the problem. Hiowever it could also be a sign of bad flash memory..or not. Do you have the latest firm-were installed ? Line6 monkey will do all this for you also.

Also when you turn on the XTL you should see the installed packs displayed as the machine wakes up.

If all else fails give Line6 a call. I'd not use the forum or the FAQtrack as they both suck.