Colour incorrect as the following shown could arise no matter duplicated mode or extended mode is selected when Mac device is connected to GV1 with a USB type C cable.
To fix the issue, please follow the steps be to adjust projector colour setting on Mac system.
System Preferences > Displays > Select "BenQ PJ" > Select "Color LCD"
Then colour will back to normal as the following shown after the above setting is applied.
Thanks for letting us know. How would you describe this FAQ?
Thanks for your feedback!