Confirmed on Windows 7 (64-bit) as well.

However, the problem seems to be just simple syntax errors in the ior.inc file,
causing it to fail. Easily fixed (or so it seems!)

One of the new features of v3.71 is the "optional" keyword, for macros. (It's
*completely* new to me, so I haven't had a chance to figure out how it works.)
But in POV-Ray's help file, an example is given that's written like this...

#macro Foo(P1, optional P2)
#ifndef(local.P2) #local P2 = 0; #end // provide default for P2
.....
#end

Note the 'dot' before P2.

However, in 3.7.1 beta 3's ior.inc file, there's no 'dot' preceding such an
'optional' variable (quite a few of those variables, in fact.) I think that's
where the fatal error message(s) are coming from.

Instead, such constructs are erroneously(?) written there as

#ifdef(local (disp))    (this is the first error at line 84)

They should be like this, AFAIK...

#ifdef(local.disp)

I did a search-and-replace of all such syntax errors, and the ior.inc file no
longer fails. (I haven't actually *used* that new ior.inc file yet, though...)

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