I've noticed more and more I'm having a problem when I reply to a quoted post. The cursor moves up a line. This seems to happen when I type something incorrectly and backspace to correct it. Then I can move back to the spot I need to be in but, it won't let me type there, it goes back up a line. It's like hitting the return key(enter) instead of going down and starting a new line it goes up.
If I type in the new line above I can usually cut and paste in the former spot and then can continue typing. Using Win7Pro latest Firefox.