Thanks to all!

I had these problems also after updating the NVidia driver and also using the demo scene (spaceships).
This is a Laptop I'm using as a test machine... so, I decided to format it. Octane now works well, also with my obj files.

Sorry for this confusion (and for my english )

I just downloaded a demo version of Octane.

I installed Octane demo on my laptop, a Dell Precision M6300 with a Quadro FX3600M. The CUDA drivers are correctly installed.
Octane starts and I'm able to import obj files or open demo scenes, but if I click on the scene node, Octane crashes ...