I think the bug he's referring to is that trying to produce the following: נזוןשמו
Using this markdown:
*מו**ש**ינזון*
Appears with whole text in italics and the letter ש bold in the preview, but not in the posted version.
You get this instead:
מושינזון
Or maybe that the cursor direction reverses within the string making editing the markdown tricky - the first time I've ever edited Hebrew, that was trippy!
I'm not sure what's supposed to happen, but I couldn't edit HTML into the middle of the text (the tag was dumped to the end).
Edit: It was clarified while I was posting. Sorry for the note-as-a-answer, but considering the bug it's a pain to try and respond with a note!
I'm using Firefox 3.5 on Vista 64 by the way.