Last horizons was banned due to supposedly sterotyping pandas (?!) but, fortunatly, the ban didn't last long and this episode was eventually re-aired.
Flying Dupes was aired for the first (and only) time on August 8th, 1990. It was banned, and hence never re-aired, due to it's terriost theme - basically, the synopsis of the episode consists of Baloo having to deliver a box to the Themrian High Marshall. Little does Baloo know that the box contains a bomb which was planted there by a traitor.

Also, the episode 'Her Chance To Dream' was also banned (for 18 months, I believe) because there was an argument that it bordered on spiritualism and religion. Geez... It is a cartoon dammit!