Hi there,
I have the problem after I have reinstalled the 757 in between several times on windows 10 the same problem always shows; the CDU control panel is black and cannot be operated except for the execute button. However, the display is shown. (see photo). Oh the operating menu for GP ect doors. is black and cannot be operated. However, if you increase the PFD, it works without problems. I am at a loss. I followed all the tips that were given without success.