There is still an issue with NVIDIA compatibility on 7.0 M3, but it is rarer than the previous issue. You will still get the displays flashing if you try and connect an external screen to the external output of the NVIDIA card. In this case, the HDMI output is connected from the NVIDIA GPU and will cause the flashing issue.
We don't have a fix for this but are working on it... Again it seems to be some strange things NVIDIA do with the graphics.
To check the theory, the issue should not occur if you disconnect the HDMI monitor.
Wim
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