[Sony Vegas 9] Problem with Picture-in-Picture (Track Motion)

[BramJ]

I have created 2 picture-in-picture's which are both on a separate track above the main video, then I used the Track Motion function to resize and place the picture-in-picture.

The problem is that during both PIP's you can also see the PIP-video flickering fullscreen. I have uploaded the video to youtube for you to see:
The problem is quite obvious at around 11 and 22 seconds.

Does anyone have an idea why Vegas is doing this? And more important, how to fix it?
any help would be very welcome

[BramJ]

Problem solved with a tip from another forum. Using the Pan&Crop tool instead of the Track Motion tool did the trick

here is the result:


Now to get some decent footage and do some more editing