Parallels 17 screen flickering, artifacts and red flash

Discussion in 'Windows Virtual Machine' started by fpmalard, Aug 11, 2021.

  1. fpmalard

    fpmalard Member

    Just installed Parallels 17 with its default video settings and have also tried a bunch of OpenGL boot flags like "video.gl3=2" and "video.gl3=1".
    In all cases I can see red flashes and graphical distortions on some applications like AutoCAD.
    This wasn't happening with previous latest 16.x version.
    I was hoping the new version would come with lots of improvements and bug fixes with OpenGL but it seems it is quite the opposite.
  2. Mikhail Ushakov

    Mikhail Ushakov Parallels Team

    Thank you for your feedback.

    1) Above all, please shut down Windows (Actions > Shut down), open its configuration > Hardware > Boot flags > Advanced... > remove all flags. Start the virtual machine and reproduce the issue. Once the issue is reproduced, please take a screenshot and collect a technical report (click Parallels icon || > Help > Send technical data > check "Attach screenshots..." > press Send Report) and send the report's 9-digit ID in a reply to this e-mail.
    2) Please provide us with a step-by-step scenario for local reproduction.

    Look forward to hearing from you!

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