Hey Jackie,
Every time I unlocked the preview winow it worked. I normally keep it locked.
1. Uninstall 4.02
2. Restart your computer
3. Reinstall 4.02
This should clear up your problem which I've never seen by the way.
I hope this helps
Jim
P.S. Crossfade is down the list a little but will be included soon. They have to get the Import Video feature going first, hang tight.
