Graph zoom hangs

[Stuffle, David (Corporate)]

I'm having a strange problem zooming in on some of my graphs.  When I
click on the magniy glass icon, no graph shows and the browser just
hangs waiting for something.  Below is part of the httpd log which is
the only log I can find with anything relevant.  

Weird thing is, other graphs using the same test and graph definitions
work fine, and other graphs from the same host work.  It's just "some"
of the graphs that do this.  I've deleted the rrd file and let it
re-create it, but still same thing.

I'm using rrdtool 1.2.26 and Hobbit 4.3.0-0.20080103 on Redhat 5.

Any help is appreciated.  Thanks.
D. Stuffle

httpd.log
[Tue Jan 29 11:35:58 2008] [warn] [client 10.252.45.195] Timeout waiting
for output from CGI script /usr/local/hobbit/cgi-bin/hobbitgraph.sh,
referer:
http://corp-hob-001/hobbit-cgi/hobbitgraph.sh?action=selzoom&graph=custo
m&host=t-adesacom002&service=ncv:jvm&disp=t%2dadesacom002&first=undefine
d&count=undefined&graph_start=1201593011&graph_end=1201603493&graph_heig
ht=120&graph_width=576&color=green

[Tue Jan 29 11:36:05 2008] [warn] [client 10.252.45.195] Timeout waiting
for output from CGI script /usr/local/hobbit/cgi-bin/hobbitgraph.sh,
referer:
http://corp-hob-001/hobbit-cgi/hobbitgraph.sh?host=t-adesacom002&service
=ncv:jvm&graph_width=576&graph_height=120&disp=t%2dadesacom002&nostale&c
olor=green&graph_start=1201450159&graph_end=1201622959&graph=custom&acti
on=selzoom

[Tue Jan 29 11:37:41 2008] [warn] [client 10.252.45.195] Timeout waiting
for output from CGI script /usr/local/hobbit/cgi-bin/hobbitgraph.sh,
referer:
http://corp-hob-001/hobbit-cgi/hobbitgraph.sh?host=t-adesacom001&service
=ncv:jvm&graph_width=576&graph_height=120&disp=t%2dadesacom001&nostale&c
olor=green&graph_start=1201451735&graph_end=1201624535&graph=custom&acti
on=selzoom

[Tue Jan 29 11:37:41 2008] [error] [client 10.252.45.195] Premature end
of script headers: hobbitgraph.sh, referer:
http://corp-hob-001/hobbit-cgi/hobbitgraph.sh?host=t-adesacom001&service
=ncv:jvm&graph_width=576&graph_height=120&disp=t%2dadesacom001&nostale&c
olor=green&graph_start=1201451735&graph_end=1201624535&graph=custom&acti
on=selzoom
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