Apache problem when printing

[albert <..hidden..>]

Environment: Windows 7 / Apache2.2.17
LedgerSMB throws an error when printing but the culprit seems to be Apache.
The Apache log file tells me

latex: A required file system path could not be retrieved.\r, referer:
http://localhost/ledgersmb/ap.pl
[Sun Nov 14 14:38:59 2010] [error] [client 127.0.0.1] latex: Data: 35\r,
referer: http://localhost/ledgersmb/ap.pl

The environment variables for PATH (when printing them in  the browser):
PATH =
C:\Perl\site\bin;C:\Perl\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program
Files\PostgreSQL\8.4\bin;C:\Program Files (x86)\MiKTeX 2.9\miktex\bin;

Running the next script in DOS (command window) works just fine, telling the
path variables in Windows are right.

$ef = 'C:\tmp\ap2.tex';
system("latex --interaction=nonstopmode $ef");

Running (basically) the same script (analogue to what LedgerSMB does) gives
a similar Apache error as indicated above
#!c:\perl\bin\perl
use CGI qw(:standard);
$ef = 'C:\tmp\ap2.tex';
system("latex --interaction=nonstopmode $ef");

Anyone knows what needs to be done to fix this (in Apache)?
I thought I was done with printing
Tx
Albert

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