I cannot say for absolute certain without seeing the source code for POVray,
but I know that if vpmS is ever equal to zero, that would likely cause such an
error. "malloc" is the name for the instruction to allocate a block of memory.
When nesting this inside a macro, you may be experiencing a "look-ahead"
problem- the compiler has to evaluate everything before it can get the true
value of vpmS, and it may not do so at a certain nesting depth.
    Just a thought, and it seems that I have seen a similar problem discussed
before.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

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