Issues with THPS4 (PAL)

[hitnrun]

I have just bought Tony Hawks Pro Skater 4 for PSX. I am trying to make a backup copy but to no avail.

Chipped PSx, many other backup gamers work, and I haven't changed burners etc.

Basically I can burn fine, no errors reported, but booting the game is a no go. The PSX goes straight into the mem card screen.

I have tried CDRWin, Nero and CloneCD, I have never really had a problem with any backups before (apart from lack of knowledge).

Is anyone able to spread some light on this subject?? Is it just an unburnable game? I guess I don't mind if it is I can still use the original, but with little sisters running around the house I usually use backups.

Cheers,

Tim