Created attachment 73484 [details] Screenshot of transparent pulldown menu in bugs.kde.org Pulldown menus are mostly transparent. Repeated mouse clicking shows the menu contents perhaps 10% of the time. It's possible to display individual menu entries using the mouse scroll wheel. This started happening with 4.9.0; it was OK in 4.8.x.
Created attachment 73485 [details] Screenshot of main window moved sideways to show transparent window
Do you use NVidia binary driver? *** This bug has been marked as a duplicate of bug 304990 ***