Menu select item stuck on screen after context or command menu has closed

Problem

Periodically when I select a menu command, the label or selected option gets "stuck" on screen and won't go away. I can close all open applications, including whichever one I was using when it got stuck, but it still won't go away. In the screenshot below, I opened an new instance of IE just to show how the label stays on top. The label was not created by this instance of IE. (I added the circle in MS Paint. That part isn't stuck.) The label that gets stuck is the first menu command I select in IE. If a label is already stuck, a new one does not get stuck (regardless of which instance(s) of IE are involved). Based on this knowledge, I now just open IE on my secondary monitor, carefully open the context menu so the Properties command is in the bottom corner, and click it. This is not a solution. The floating label never moves and is transparent to mouse input (if I click it, it's as if I clicked the item behind it). The label does not go away if I close all running applications. I have…