Destroying video quality durring editing

[kamat58138144]

Hi guys
I have a problem with view of program monitor while editing:

It happens randomly for no reason, I mean no relation with any action. It disappears when I output an adjustment layer, but that's not necessarily the case. Also after export, sometimes the quality is completely destroyed, but after the second export, everything is fine.

Thanks in advance for help.

[Richard M Knight]

There's a good chance that you need to update your graphics card driver.

[kamat58138144]

Thanks for answer. I'm using macOS Big Sur 11.3 Beta, graphic Intel Iris 1536, updated. Do you think it might be a problem with Big Sur ? Actually I didn't have those effects before installing new system.

[Richard M Knight]

Sorry I'm not a Mac person, I'm sure someone with better knowledge will be along.