Cuda 3.1 lists Fedora12 and Cuda 3.0 was Fedora10.
I wouldnt pretend to know about Linux or the intricacies of Octane but perhaps there is some hope for you. I think Cuda is backward compatible however that doesnt necessarily mean the present Demo would run on it. It does mean however I think that fairly soon the commercial version would run on the dist you have currently. Perhaps the Octane Demo version will be updated soon too and these occasional driver/toolkit gotchas wont frustrate the few prospective customers like yourself who happen to be slightly out of phase with the versions Refractive used in development.
Octane is somewhat on the edge of technology and dependant on Nvidia for driver and Cuda availability/compatibility.
HTH. Cant say other users dont try to help
