Let me set the scene:
I quote a post I want to reply to. I delete the parts that I do NOT want to reply to.
So far so good. Well, then I am left with no way to put the response to the quoted text below the quote box (the cursor simply will not go there).
This is the problem some others have reported having.
That's the prelude. Everyone with me so far?
I pop over into Source mode and add some <br /> s below the existing quote. This should give me a few line breaks below the quote box, for when I switch back out of Source mode.
The editor ACTIVELY DELETES those <br /> s!
When I pop back out of Source mode, the editor pretends to see them for all of microseconds, then it's back to same as before. And when I switch back to Source mode, the things I added are -gone- from the bottom.
I now have to start typing response text in Source mode to get the <br>s to stick.