Control: reassign -1 libgtk-3-0 3.21.5-3 Control: affects -1 gnome-boxes Control: severity -1 serious Control: forcemerge -1 832077 Control: affects 832077 emacs24
I downgraded libgtk-3-0 to 3.20.9-1, and that fixed this bug. Running gnome-boxes with libgtk-3-0 3.21.5-3 and running a VM with display via Spice triggers this issue. Looking at the console shows numerous error messages about GtkGrid and GtkOverlay objects "drawn without a current allocation", starting at the point when rendering stops working. That doesn't occur with libgtk-3-0 3.20.9-1. Searching turns up various other mentions of applications breaking with similar error messages when using GTK+ 3.21. I've merged this bug with another libgtk-3-0 bug reporting a similar issue with emacs24, and raised the severity as it affects other packages as well; this looks like a widespread issue. - Josh Triplett
