Thanks @Pascal for indicating that the drop down menu lists do appear by selecting XRender as the rendering engine.
Unfortunately XRender has other issues. The reason I originally changed away from using the default settings is because then I had issues with screen tearing [1] and an inability to login due to SDDM login screen hangs [2]. [1] https://askubuntu.com/questions/764302/screen-tearing-on- kubuntu-16-04-with-intel-drivers [2] https://askubuntu.com/questions/765364/kubuntu-16-04-sddm-login- screen-hangs/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1780664 Title: Recent libgl-mesa graphics update prevents drop down list menu appearing in apps like firefox three line/bar menu icon To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1780664/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
