alpha gradients on pdf surface

Maarten Mostert <[email protected]>
Newsgroups gmane.comp.lang.smalltalk.vwnc,gmane.comp.lib.cairo
Message-ID <[email protected]>
Hi,
I experience a bug in linear gradients on the Cairo PDF surface. 
If I define any other alpha value then 1 the gradient isn't drawn anymore (leaves a blank), on other surfaces is draws fine.
My binaries have a version string of 1.20
Is this a known issue ??
Regards,

@+Maarten,
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