Well thanks for the advice guys. I tried MajorTom's fix to no avail. It seems to be an issue with running GP3 in Windows 98 compatability mode... however if I don't run it in that none of the newish tracks run and crash back to desktop instead.
On the asserts, this is what I got back after a crash running in 98 mode:
0x00413419 -> Bump range too high. Wrong slot or no cmagic used or wrong bump table made.
0x00413419 -> Bump range too high. Wrong slot or no cmagic used or wrong bump table made.
0x00413419 -> Bump range too high. Wrong slot or no cmagic used or wrong bump table made.
0x00413419 -> Bump range too high. Wrong slot or no cmagic used or wrong bump table made.
0x00413419 -> Bump range too high. Wrong slot or no cmagic used or wrong bump table made.
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