motion 5 keyed output into blender. Having problems with alpha channel in VSE

Struggling in Blender 2.66 vse to get motion 5 keyed .mov to allow background strip to ‘show through’

Any idea would be most welcome.

I’ve come across comments about pre-multiply alpha ‘bugs’ in blender vse. Are they true?

How can I get a background strip to show through a foreground strip in blender 2.66 vse? I would have thought it was a piece of cake, but after hours of struggling, still can’t get it to work :frowning:

Is it something to do with Strip settings? If so, how are these set?

love and peace, Sol