cvsgraph integration not working?

[Gernot W. Schmied]

Hello,

I've tried to get cvsgraph 1.4 working with cvsweb 3.0.0 for hours now.
It just produces an empty page, no image, no errors, nada. I am pretty
sure the configuration file is OK (binary path, cvsgraph.conf). I can as 
well see the little symbolic icons beneath the files. I tried
cvsgraph from the command line and it produces a perfect png, but 
unfortunately not from within cvsweb .-(((. It just appears the image is 
not displayed.

--- relevant section from cvsweb.conf ---------------------------------
# Allow graphical representations of file revisions and branches with 
CvsGraph?
#
$allow_cvsgraph = $CMD{cvsgraph} ? 1 : 0;
 

# Path to the CvsGraph configuration file.  Only used if $allow_cvsgraph
# is true.  Leave this empty or comment it out to make cvsgraph(1) use its
# default configuration file.
#
$cvsgraph_config = "/usr/local/etc/cvsgraph.conf";
-----------------------------------------------------------------------

Any advice greatly appreciated.

Gernot