Resolving "murrine_style_draw_box: assertion `height >= -1'"

Finally figured out how to stop this message from popping up after every key stroke if I've launched emacs from a terminal.

Modify the entry in /usr/share/themes/Ambiance/gtk-2.0/gtkrc from GtkRange::trough-under-steppers = 0 to GtkRange::trough-under-steppers = 1. Change Ambiance to whatever theme you are using.

Source: The Hack List