Precision editing green screen

So I tried using the green screen function with iMovie09. I first put the background clip into the project, then dragged the foreground on top of it, and then selected green screen in the pop up menu. Both clips were 5.0s.
I found it impossible to coordinate the clips so that both appear at the same time when the movie is played back. Also, sometimes the transition from the previous clip would not work at all, and sometimes it would but the two 'green screen' clips would start at different times.
I had a One-to-One session at my local Apple store yesterday, and the guy in the store and I spent 40 minutes trying to get it right, trying to tweak the clips in normal view and the precision editor. We also played with the transition times and tried deleting it all and re-importing the clips and transitions to the project. Never could get it synchronized...
Anyone else had this kind of problem? Anyone found a way to sync up the two clips with green screen?
Tks

what is your "background/foreground" source - both are imported clips from my Canon HD camcorder (digital tape)
have you tried to adjust the thumbnails view in your project? - yes. In the Apple store, the guy tried changing the thumbnails to 10 secs and then 30 secs. In precision editor we tried adjusting also.
Regarding the transitions not being visible, if you are positioning the green screen layer on top of them, that's expected. - yes, it seemed that we were occassionally over/underlapping one of the clips with the transition, which caused the transition not to work. But even when we had this fixed and the transition worked, the background and foreground clips would appear at (very) slightly different time.
drag the beginning of the green screen layer at the very beginning of the background layer. - yup, seems like that would do the trick, but as above, there was a split second difference between the beginning of the clips. The foreground was my daughter's face, and the best we could do was get her to appear about 1/4 second after the background. We thought the transition would 'override' the start of both clips so they would appear simultaneously (and hence tried increasing the transition time), but it wouldn't work.
As per the other thread, it would also pause/hang up for a few seconds on every adjustment which is rather infuriating on top of this problem.

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Precision editing green screen

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