Hmm, I have no other reports about corrupted files using Octane. Have you loaded an Octane scene file in a Houdini without the Octane plugin? This can indeed destroy all the Octane nodes and information, and I'm not sure if a scene file corruption is possible even in this case.
Do you know if Houdini crashed while saving the scene, or the scene file has become corrupted without a previous crash?
Computer Graphics Software Developer
Octane plugin development and support: LightWave and Houdini