I've had some problems with pasting. Doing it, and then pressing Enter > try to get a new line > it jumps "wherever"... and pasting bold text, it's nigh to impossible to get normal text after that.
Line 1. In normal writing, no problems. Line 2. Still no problems. Line 3. The saga continues...
On the reply window, there is the A/A option on the menu. You might try using that to change to a different mode to see if it helps. I have gotten where if I run across the situation where the bold won't turn off, I can use that and manually change the codes.
It does make a difference if you are running Windows 8 as to whether you can use the standard editor or wysiwyg.
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