Well, I find myself in the same position...
I've uninstalled, reinstalled, removed and replaced files time and time again, only to have the same result.
The walls, floors, bike trail, and everything else is fine. Except the bike. It won't appear for some reason.
I've tried various things, only ending with the same problem. Even messing up my download of Armagetron Advanced.
So I want to see if anyone else can help. I use Windows and all other moviepacks have worked fine before. No problems at all. But this bike, the cycle.ase, won't appear.
Help?
