Sorry, sorry, much apologizings. Jan very busy...Jan taking care of much important business (going to see WALL-E).
It was the second season that got the re-recording of the opening credit, as Hirogen Alpha
said, because Bruce didn't have a chance to see the visuals before doing the recording.
The second clean-up that I'm aware of was for the fifth season opening sequence and that didn't make it to the DVDs either. The version on the DVDs has some of the lines spoken very unclear. Shame, too, since it's my absolut favorite opening and theme.