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I checked the "Transmit AOVs" option on a glass material to get the proper transparency on a rendered image. It worked as it should, however I started getting tens of thousands of warnings all saying this same thing: "Out-of-range sample alpha in pixel", followed by a coordinate and value of "alpha", generally below 0,1 (picture).
Also, the render time more than tripled after that, so it's definitely doing something it shouldn't.
This is likely a bug tracked in ARNOLD-7442/ARNOLD-12159. Until this is fixed in Arnold, I think disabling dispersion in the glass material might avoid this problem. Also, maybe if you lower the max number of warnings that might improve performance (all those warnings being printed out can slow things down).
