I've been trying to reproduce this problem here with several scenes and even with Arnold and other renderers installed at the same time and really I can't reproduce it, something that is frustrating given the seriousness of the problem
You are working with the current Houdini 17.5.173 production build, right? Can you please attach the Octane log file that you get after rendering something in your system? You can configure the log file in the plugin options panel.
If you can send me one of your scenes before it being corrupted, perhaps it could help to check if there is something weird on it (who knows, a weird material name or nodes configuration, etc.)
Do you have any news about this issue? Have you had this problem again? Any help about how to reproduce it could be very useful, although I had no other reports about a problem like that sent from any user in the latest weeks ...
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