Anyone having trouble previewing or editing a video after insertion in SL3?

HI:

I have a short video clip I inserted in a project.  It shows the the initial image on the slide in authoring mode.  However, if I try to edit it, it shows black and when I preview the project.  I have used the same clip before when I had SL2. I didn't have any issues.  Is there a bug in SL3?  its an mp4.  

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