Quite often, when I stop the Visual Studio debugger (possibly mainly when I just did an "edit and continue") the mouse enters a kind of "ClickLock" mode: the text is automatically highlighted between the current mouse location and the location where it was when I stopped the debugger. Impossible to move the mouse (or the cursor using the arrows) without highlighting text (I.e.: doing a text selection)... So, impossible to work anymore as pressing any key will immediately delete the selection.
I found only a few reports about that "issue/behavior" on the web. I still have no idea how to prevent it. But I found a way to halt it when it occurs: Press Alt-Gr + CTRL + SHIFT