Comment 2 for bug 30146

This only happens when the menu bar is on the bottom of the screen. I believe the reason for the problem is the following. If the icons are not loaded in memory, Gnome computes the menu height ignoring the icons, i.e. considering only the text height. And it chooses a menu position that is correct for THAT height. Then, when the icons are loaded, the menu height increases, but Gnome does not update the menu position, so the menu ends up too low and gets truncated. This is just a guess though.