Right-click bugs and black screens in the Editor window

Yup exactly the same issue. @rntlpbm do you have a 4k and fullhd dual monitor setup? Do you have the 4k monitor at 125%?
My colleague as a dual 4k at 150% and doesn’t see the issue. As a side note, I only start to see this after updating to 4.26.1. 4.26.0 was fine.