Known problem.
I think alt tabbing should solve the problem ,and returning to w3. This is option when you install Ebnet installer , or patch (not quite sure) , there is some graphics improvement and there is warning that it can be blurry on some monitors (more accurate , it is too bright) , there is info how to remove it . Ask on Ebnet forum , find cen , he knows for sure.
I had same issue as well.Alt tabing worked for me .