My WP installation won't let me log out. Stays permanently logged in to the Dashboard page. When I attempt to log off, it goes to a blank white page containing no source code. When I click my Browser's Back button, I go back to the Dashboard page. Also when I attempt to edit individual pages, the same blank page problem is also occurring there too.
I tried reinstalling the contents of my wp-admin folder but that didn't help. I also cleared my browser cache and tried using 2 different browsers - MSIE and Mozilla - on 2 different computers - same problem.
I am running WordPress Version 5.1 which has worked fine for me up until now.