Using kubuntu 16.04. three days ago after an update title bars in windows started disappearing leaving the windows contents working fine... But no way to control them ( no close "X" for instance.
Login is fine, then the first window that comes up is fine. As soon as a second opens then poof everything vanishes...
Taskbar also occasionally disappearing and even when present clicking open progs on it does not raise them to the top of the stack..
I tried changing the theme but no joy. It's making the system totally unusable at present.
Anyone had a similar problem and know a fix ?