It says at plugin index building time (first start) [OpenColorIO Info]: Color management disabled. (Specify the $OCIO environment variable to enable.) [ocio_643 @ 0xe450140] Error: Config or arguments invalid. [ocio_643 @ 0xe450140] Input color space is null [ocio_643 @ 0xe450140] Display is null [ocio_643 @ 0xe450140] View is null [ocio_643 @ 0xe450140] Failed to create OCIO processor. PluginFFilter::new_ffilter(ocio) err: Invalid argument so it may work, if you have ocio config already for Natron/Blender?