In Parallels 16 (released August 11, 2020), OpenGL 3.3 is enabled for all VMs (and an option for it to be changed (“lowered”) by the user is not available). While this would normally be great news (because visualization that was not possible in the past should now be possible) we’ve discovered that several OpenGL extensions (functions) that are required by Vivien are not actually enabled in Parallels. The result of this is Virtual View issues which may make it impossible to correctly render all effects. We are currently investigating and hope to find a solution to this issue soon. Workaround: Until OpenGL 3.3 support is fully-enabled in Parallels 16, or until Parallels offers a means for the user to set which OpenGL version it should use, the recommended way to use Vivien in the Parallels virtual desktop environment, is to roll back to Parallels 15. Alternately, BootCamp may be used – and is a superior choice.