2.3 Update: Problem with AppleTV learning third-party remote
I'm trying to set up my third party remote (DirecTV HR21) after updating to 2.3. It all starts well; I go to Settings -> General -> Remotes -> Learn Remote, but I am having an issue when I am making my Apple TV learn the second key (down arrow); I get the error message "apple tv has already learned this button". It's as if the Apple TV thinks the 'up arrow' and the 'down arrow' on my remote are the same key. I tried several times, to no avail.
Anyone else having this issue?
Mac OS X (10.5.2)