I recently posted the symptoms of my problem on the "Requests and Feedback" forum, but no answer was really helpful. I think I have an internal hacking problem.
I am unable to consistently get into the "Administration" section of my site due to an apparent corruption of my Password Entry. I was able to get in one time after resetting my password and found over 1600 spam messages. After deleting them and logging off the site I now cannot get in the "Administration" section.
In addition, each time I request a new password to be sent, my system is automatically flooded with spam "Please Moderate" messages.
Unfortunately, I don't know which WP version I have.