Interesting. I use Microsoft Edge as my browser. So I entered Internet Explorer mode, and was able to log in and out. It also solved the other problems. But once back in Edge mode the problems persisted. So the problem is with Edge. I've already tried closing and reopening Edge, as well as rebooting the computer. I also just now tried clearing part of my cache data, but that didn't help. I'm reluctant to clear all my cookies.