I was unable to find the cause of the problem. In the interest of not wasting time I decided to install a backup that I had made recently. It is all back to normal now.
However, I will keep an eye to see if it happens again and if I can catch whatever created the problem. I found at least one other (not related) program misbehaving, which tells me that something was going on within Windows.
However, I will keep an eye to see if it happens again and if I can catch whatever created the problem. I found at least one other (not related) program misbehaving, which tells me that something was going on within Windows.