I'm having a problem with sound during transitions between tracks (e.g. Dissolve) in rendered video. Specifically, throughout the entire time that the tracks overlap, the sound is "crackly" (similar to playing an old dusty vinyl, but a but more regular, with crackling at ~ 5Hz --- at a guess). Outside of the transitions both sound and video are fine.
I've tried this with a number of different output formats (MPEG-2, MPEG-4, DIVX, Theora, Raw DV), and it is always the same. I've tried applying a volume effect to the tracks (lowering their volumes to 80% each), same problem. Muting one or other of the tracks removes the crackle, but obviously there is no sound from the muted track.
I'm running version 0.7.7.1 on Ubuntu 10.04 Lucid on an Acer Aspire REVO 3610.
(FWIW, playback freezes (or becomes very, very slow) in the Project Monitor when it hits the transition. I'm not sure if this is related or not---any ideas on this would also be more than welcome of course!)
Any help would be much appreciated! :)