We used to have this saying, back when we were all stuck with anarchic, unreliable Windows computers "When in Doubt, Reboot." It was really the only recourse available whenever you hit any kind of problem, hiccup, or snag with your computer. There was really no point in rationalizing, thinking, or deep analysis. Just hammer ctrl-alt-delete (or in worst cases hard-reset the power) and get on with things. In fact, due to inevitable memory leaks, lockups, and various design flaws, a good hard reset periodically was not only inevitable but healthy. Not a terrible approach, really. So it goes in life sometimes and so it goes here.
We (hopefully) now return to our regularly scheduled programming.