Thanks very much for your systematic testing!
When I ran into the same problem I remembered your post, switched from Sobol to Metropolis and got OIDIN to work again.
Then I tried the random sampler and it worked as well!
Seems the scan lines are a Sobol-only issue?
Also I discovered that the problems OIDN has with volume scattering are solved by disabling Sobol.
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Thank you much for your feedback and the completion with Random sampler. I forgot to have a look at it because I very like Metropolis. It is good to know than Random sampler is clean (stochastic well distributed) to work well with OIDN. I will use Random sampler for my current scattering volumes investigations.