The cause for this appears to be a conflict between windows that want to stay on top. Tooltips always want to be on the top. But if like most of us do, you have the Taskbar set to be kept on top of ...
Given an element, such as a button, and a tooltip element describing it, Popper will automatically put the tooltip in the right place near the button. It will position any UI element that "pops out" ...
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