Created attachment 439428 [details] Screenshot of issue. When compiled virt-manger versions 1.3.2 or 1.4.0 against gtk+ v3.20.x, there are errors in display rendering. See the attached screenshot for more details. I had to downgrade GTK+ to v3.18.9 and recompile virt-manager to make it work right. This is the upstream bug report I filed: https://bugzilla.redhat.com/show_bug.cgi?id=1352208 Hope this is useful.
I see the same issue with other applications, specifically at least: nm-applet firefox-bin Downgrading and recompiling the apps helps. Something seems broken with gtk+-3.20.6. If you need any more information, feel free to ask.
Are you still suffering this with a fully updated system? Also try on a new created user account with a new home