Shader in transparency channel

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On 07/04/2003 at 04:33, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   8.100 
Platform:      Mac OSX  ; 
Language(s) :   C.O.F.F.E.E  ;

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My shader uses tracegeometry() and Illuminance3() and works quite well in color, diffuse and luminance channel. But when I use it in transparency channel, Cinema crashes after the first or second editor render of the object. The material preview is rendered fine btw.
Is there some special flag I have to set to make this shader also work in the transparency channel or is this a bug?

Thanks for your comments and help.
Arndt