Explorer encountered a problem, now can't use left-side gestures.

Title pretty much said it all. I was trying to add videos from my Host computer's folder to Windows 8's libraries, and ended up setting up a homegroup (apparently it doesn't recognize my host computer's homegroup). But when I did, two identical windows popped up, promptimg me to finsh configuring homegroup. I completed one, and cancelled the other, then Explorer froze. After a moment an error popped up saying that Explorer encountered a problem.

After that, none of the left-side gestures worked. I could still close apps by dragging them down and launch new ones, but I can't switch between them as easily. The right-side gestures work fine.

I have shut down Win8 for now (haven't checked if the glitch persists), but I just wanted to post this as a warning of a potential glitch that could be a problem.