A couple of things worth trying.

1. Change the default media type to Windows Media Player (Right Click File in Windows > Open With > Windows Media Player)

2. Could be that the pre roll or pause times of the camera have to be adjusted. TO do this in Mediastudio capture, Set Up > Device Control (MS1394) > Options > and adjust (increae) the pre roll time.

Alternatively drop me an email and we shall ge to the bottom of this.

Good luck