[rrd-users] Strange issue with RRD/PHP

[Max Kipness]

I'm hoping someone can point me in the right direction.
 
I've had RRD running fine with PHP for some time now. However recently
when I pull up a page, I get the outline of the graph with the red X for
each graph on all the various PHP pages I'm hosting on this server.
Basically, I'm using PHP's 'exec' command at the top of the page to run
the script that draws the actual graphs. Currently, if I run the script
manually, the graphs are drawn correctly, but if I bring up the PHP page
I get the blank graphs. If I look in the graph directory I see that the
graph files have the current time and date as just being drawn, but the
file is 0 bytes.
 
I'm getting no errors in /var/log/httpd/error_log or anywhere else. I've
checked permissions, but that isn't the problem either.
 
There have been no changes to the system at all, I just noticed it the
other day.
 
Has anybody else had this problem? Any clues as to how to track the
problem?
 
Thanks,
Max
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