Wow, you apologized for double posting, then you did it again, anyway?! That's the last straw; I'm removing this thread from my bookmarks, so you'll probably never hear from me again.
Well, I remember seeing it on PBS, just not exactly when! Did you ignore the first page of this thread, or something?
Also, double posting all the time just makes me want even more strongly to ignore you. Please click the gear, then "edit post", if you have something else to say!
Now that the finished film has aired, this article needs some updating: lostmediawiki.com/Hey_Arnold!_The_Jungle_Movie_(partially_found_cancelled_original_film_adaptation_of_Nickelodeon_animated_series;_2002)
I've also considered the possibility that only some PBS stations received the Johnny Kemp intro, to help test how well or poorly viewers would respond to it. I imagine in this case, the other stations would've continued to use the Tina Fabrique intro, until PBS started rolling out the one with Chaka Khan.