Hmmm. That is very odd. I hadn't noticed this, but perhaps it is a new bug. Anyone else notice this?

It doesn't happen for me. I started a new article, typed stuff, then went to the middle of a word with the arrow keys and typed some letters. Then I moved the cursor with the mouse and did the same. I then repeated all of this in an existing draft. No time could I make it do what is described. My suggestion try pressing your Insert key.

I think that was something you inadvertently did on your keyboard. I've had the same issue in word processors in the past. I think its an option some people use when typing.

Yeah, that sounds like the Insert key on the keyboard.  The Overtype mode replaces letters that are in the space you are typing in.  It was annoying because, in high school, there was always that one guy who would switch the computers to overtype before the next computing class started.

Ajimbo wrote :
It was annoying because, in high school, there was always that one guy who would switch the computers to overtype before the next computing class started.
-end quote

Well wasn't that guy just clever. I never had to worry about such things because the only computers we had when I was in high school were Tandy and Texas Instruments PCs that were already archaic (even in the late 80's) and lame. They just sat in the back of one of the classrooms and never got used.