Okay, so it's mostly working again. Not sure exactly what happened. Since Minergate was working after XMR STAK quit, I decided to try Nicehash when I got home last night. But first, I removed and reinstalled drivers, and did the Win 10 Anniversary update (I had been meaning to for a while, but I didn't want to stop mining log enough to restart
). That didn't help, sadly, nor did playing w/ threads and blocks in the config. I started Nicehash and gave up for the night.
Early this morning, my 1060 crashed super hard to the point where Afterburner didn't even see it anymore. I restarted my rig and prayed it wasn't dead. Everything looked normal so I started XMR STAK just to see what happened, and it ran like nothing was wrong (save for the hashrate drop).
So, yeah, don't know what that was about. Chrome browser was working, other miners working... At least it seems to be over for now. Thanks for all the suggestions. They may still come in handy lol.