POV-Ray 3.5 RC6, RedHat 7.1, AMD Athlon 1.2, 256 Meg

First of all, thanks for continuing to provide a Linux version of the 
POV betas :)  I'm having a small problem with an isosurface. I have a 
simple isosurface scene (taken from a larger file) that runs fine in the 
Windows version of POV but does a Segmentation Fault (core dumped) in 
the Linux version (both 3.5 RC6). Here's the scene:

[start of sample scene]----------------------------------

camera { location <0,2,-3> look_at <0,0,0> }

light_source { <50,100,-100> rgb 1 }

isosurface {
   function { abs(x)+abs(y)+abs(z) }
   contained_by { box { <-3,0,-3>, <3,0.5,3>} }
   threshold 1.3
   max_gradient 2
   pigment { rgb <1,0,0> }
}

[end of sample scene]----------------------------------


[start of gdb snippet]---------------------------------

Persistence of Vision(tm) Ray Tracer Version 3.5.beta.RC6 Unix (.Linux.gcc)

Parsing...

Creating bounding slabs.
Scene contains 1 frame level objects; 0 infinite.

Displaying...
Using 24 bit TrueColor visual...
Rendering...
Program received signal SIGSEGV, Segmentation fault.
0x08067eff in POVFPU_RunDefault (fn=0) at fnpovfpu.cpp:1349
1349    fnpovfpu.cpp: No such file or directory.
         in fnpovfpu.cpp

[end of gdb snippet]---------------------------------

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