problem with git-browser

I've installed gitweb with the git-browser extension.  But when I try  
to access the « graphic log », it doesn't show up.
I get: « closeError: invisible_get: timeout requesting /cgi-bin/git- 
browser.pl?sub=commits_from_refs&repo=cvsConvertedRepo.git&ref=r% 
2Call&shortcomment=1 »

I tried to debug (Firebugs), and surprisingly, this call (above) does  
return a content (and does look valid).

I've put breakpoint in the javascript code, but can't get to fix it.
Is it a known bug ?  Is there a workaround ?

Some more info :
: uname -a
	Darwin xxx.local 8.11.0 Darwin Kernel Version 8.11.0: Wed Oct 10  
18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC Power Macintosh  
powerpc

: perl -v
	This is perl, v5.8.6 built for darwin-thread-multi-2level
	(with 4 registered patches, see perl -V for more detail)

: httpd -v
Server version: Apache/1.3.33 (Darwin)
Server built:   Mar 20 2005 15:08:27

- jfv