Comment 11 for bug 1715173

This problem is a bit more critical than first meets the eye. The two letter US code shows up when in a text input context of some sort, and disappears when such input doesn't make sense. This leads to an unfortunate case where attempting to click on the menu item when the code is visible, switches to a context where it disappears, and the entire desktop becomes unresponsive to mouse and keyboard input.

I've attached a short video showing this effect in 18.04 beta1. What is not shown is the way to escape this locked state this problem is to switch to a virtual terminal, and force a new instance of mate-panel to be launched.