Strange behaviour after an update today

[anssi]

Hi, i had the same problem, found a solution on Firefox bug tracker.
Switch the renderer to XRender in compositor settings and menus in Okular and Firefox are shown again.
Must be issues with the drivers for OpenGL?

Hi, thanks for that bit of information. I signed up to say thanks since this annoyance bit me too. Yakuake and keepassx are the affected apps I use mostly and at least the buttons work in keepassx so it's still mostly usable.

Someone has reported this as a bug in Ubuntu too, https://bugs.launchpad.net/ubuntu/+s...a/+bug/1780664

He conveniently even has rollback instructions. Otherwise it doesn't look that promising.