Trying to crop a 4:3 in 16:9 video INPUT is KDENLIVE project

** EDIT 6th Feb 2011**
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** These problems come out only when as input file I use a kdenlive project! *********
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Dear all,

I'm trying to crop a DVB video saved as 4:3 into a 16:9 (without the black strips).

Kdenlive: 0.7.9 (dev ppa)
MLT: 0.6.3 (dev ppa)

I've tried all the tools for cropping:
- crop: it does no work at all. I changed values in any way, tried to export but without changes

- Transl. and zoom: the interface is not very easy, but I could set the 16:9 dimensions with good proportions. The yellow rectangle and image are not in synch at all.
The problem then is that the exported video has a small image (scaled about 2/3) not showed in the preview (I think my error).
Frankly, I'm not able to use this function :-(

- Scale and Tilt: this function is easy to understand and use. The preview works fine but... the exported 16:9 file has two vertical black strips "cropping" it at 4:3. Just to explain better I add some image:
http://dl.dropbox.com/u/7540375/projectSettings.png
http://dl.dropbox.com/u/7540375/exportSettings.png
http://dl.dropbox.com/u/7540375/ffplayOutput.png

I've tried to change project properties without luck.

If I'm doing something wrong, please help me! :-)

thank you
Dino