I've had problems with Premiere 6.0 before, but this takes the cake.

I'm editing a monologue, and occasionally, traffic passes by in the background. This can usually be eliminated with the handy Highpass audio option, which gets rid of the low rumble.

I've used it before with footage from this very tape. It works. Everything's fine.

EXCEPT...now, when I alter a clip's audio in any way, the audio in clips on either side of it inexplicably SLOW DOWN, while the video remains untouched!

To be clear, I'm not doing anything to the clips before or after this one clip's audio. They just change on their own. Even more bizarre, the effect starts and ends halfway through the clips before and after main clip, as if Adobe is just randomly changing the sound a few seconds here and there.

I don't even know how to slow down or speed up the sound if I wanted to, and since the other clips aren't "officially" affected, there's nothing to unselect or uncheck. It's like the effect -- a random, slowing effect, not the effect of Highpass -- has just bled all around the audio clips.

I've searched the web for a few hours and I'm completely stumped. Does anyone have any idea why this would happen, and how to undo it?