Categories and redirect do not work in the same post. The developers hope to be able to address this in a future release, but it is very difficult.
The ampersand also causes problems because it is difficult to parse the character that is the backbone of special character handling in html. The developer thinks he has that fixed, but I am still not certain that it is fixed.
================== later =====================
On the other hand the variant I created about two hours ago is gone now?