[scribus] Transparency over image

[S C ribus]

All

I needed an image to be covered by an opaque to transparent gradient (rectangle shape with linear gradient: white with alpha 100 to white with alpha 0) but when exported (preflight does not show any error) I could not get the image to show underneath - instead the white square was full white (hiding the picture).
I tried PDF 1.3 1.4 and 1.5 
I quickly used an exported png as a workaround - that worked ok, but I'm not sure what I did wrong.
Using Fedora 11  1.3.3.13

Cedric

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