Graph images not displayed correctly

Hi all,

I recently upgraded to the latest Cacti 0.8.8b, and the latest spine.
I also installed the latest Boost. Everything is work great except
/graph_image.php

I have the weathermap plug-in  installed, which is working fine too (I
changed the weathermap config to work with Boost). However it uses
/graph_image.php to generate mouse-over graphs for links. These aren't
working. When I browser to;


http://my-cacti-server.com/graph_image.php?local_graph_id=6583&rra_id=0&graph_nolegend=true&graph_height=100&graph_width=300

for example, In chrome I just get the broken image icon. In Firefox I
simply get;

The image "http://my-cacti-server.com/graph_image.php?...." cannot be
displayed, because it contains errors.


How can I troubleshoot this?

Many thanks,
James.

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