Comment 5 for bug 692635

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Severin H (severinh) wrote : Re: Crashes due to Gdk:ERROR...miUnionNonO: assertion failed: (y1 < y2)

Just came across a rather helpful text regarding thread-awareness of GTK: http://blogs.operationaldynamics.com/andrew/software/gnome-desktop/gtk-thread-awareness.html

Looks it would be a good idea to go over the whole application and check whether all interactions are protected by the GDK lock, either implicitly within the main thread or explicitly using gtk.gdk.lock.