I had a similar problem recently on the Explosion 1- 4 Emitters, which meant when I brought them into my Avid (and DS) the Explosions would happen cleanly but the Smoke would be left behind as a big Black blob for a few seconds then disappear. I exported the Explosions always as a series of Targa Files (first with ‘Remove Black Background from RGB Channels selected, then deselected) and nothing made any different. It took a lot of playing with the Emitters and eventually altering Visibility parameters to get it to look better.
I was wondering if anyone else had these issues.
Razor