If I just drag in the clip, 


If I just drag in the clip,  I have sound.


If I use In and Out points in the preview monitor, then insert it, I have no sound.  Then if I delete the clip and drag it in again, I still don't have sound.


Also, sometimes when I drag in the clip most of the timeline has a red graphic glitch, like the whole timeline turns red.  I'm wondering if there's a Lion compatibility issue.

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