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shadow blending on iMac G5 fails

Hi,

I have a shadow renderer which works on my iMac G4 (nVidia GeF2) and my iBook G4 (ATi Mobility Radeon) but on my customer's new iMac G5 it doesn't.
The shadow itself is created in a pbuffer then "blended" (src = GL_ZERO, dst = GL_SRC_COLOR) it to the game world.
It was OK until he saw my game on iMac G5 (nVidia GeF5200) where all shadows rendered in the game were inverted and clipped from a rectangular shape. The shape was very similar to the current framebuffer content (not always but often) but distorted to a texture and the shadow was clipped from it.

I'm on searching the real reason of this misfunction but please help by dropping wise hints :)
Thanks in advance,

Gábor

To be is to do. - Socrates
To do is to be. - Sartre
Do be do be do. - Sinatra
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