The issue is a GTK one: http://bugzilla.gnome.org/show_bug.cgi?id=316087 ** Changed in: gtk+2.0 (Ubuntu) Priority: Unknown => None Assignee: (unassigned) => Ubuntu Desktop Bugs Status: Unconfirmed => Confirmed ** Bug 47498 has been marked a duplicate of this bug -- Column resizing acts strangely https://launchpad.net/bugs/25940