there seems to be an error with png-output, I get ridiculously large files 
(a 64x64 rendering of the cornell-box gives me a 65MB png, or a 13KB BMP), 
and after a few iterations (ranging from 10 to 300, so far), I get the 
error-message:
"
Possible Rendering Error: libpng: buffer error
Rendering Error: Cannot write PNG output data to [outputdir]
Possible Rendering Error: Cannot write PNG data.
Possible Rendering Error: Cannot write PNG data.
Possible Rendering Error: Cannot write PNG data.
"

followed by the scene processing times and POV-Ray proclaiming it has 
finished

I'm using a slightly modified version of sample_08.pov (changed montecarlo 
{ mc_diffuse { 1 2 2 } } into montecarlo { mc_use_cosine_distrib mc_diffuse 
{ 1 1 1 } }) on an AMD Athlon64 X2 5600+ with 2GB RAM, running under Windows 
XP SP2

cu!
-- 
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x)            // ZK http://www.povplace.com

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