Issue number 1:
I have the same issue with cursor working and not working in the search bar. The only way I can solve it is to go to the task manager and end task Windows Explorer. That will solve it immediately but the error does occur again. Until I found out about the ending Windows Explorer via the task manager, I had to restart my system which was ridiculous.
If I end the process via task manager Windows taskbar disappears, and I have to restart.