same problem with Xubuntu 18.04.3 64bit 5.0.0-25-generic + ppa:xubuntu-dev/staging (on machines with Intel GPU)
- not help update Mesa to 19.0.8-0ubuntu0~18.04.1 from ppa:ubuntu-x-swat/updates
- only help disabling Compositor in xfwm4-tweaks-settings as workaround
same problem with Xubuntu 18.04.3 64bit 5.0.0-25-generic + ppa:xubuntu- dev/staging (on machines with Intel GPU)
- not help update Mesa to 19.0.8- 0ubuntu0~ 18.04.1 from ppa:ubuntu- x-swat/ updates settings as workaround
- only help disabling Compositor in xfwm4-tweaks-