I also sometimes happen to me, and I also turned off StickyKeys. Sometimes I see this when I lock my computer. When this happens and I try to enter a password, the computer acts as if I press a control button.
My only suggestion is to use the menu to stop debugging, and then gently touch the control key twice, then try again. He always stops when I do this.
At heart, I wonder if this is due to conflicts of third-party utilities that intercept key combos for their triggers. SnagIt, Freesnap, AutoHotKey are the three that I use, but when the problem is so intermittent, you can't really turn them off and say, "yup, my problem is gone."
John anderson
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