[mrtg] mrtg graphs keep clearing out...?

[Trevor Mankus]

can someone help me?
 
my mrtg graphs keep clearing out and resetting.  the traffic starts logging fine, and after 12-24 hours the graphs wipe clean.  what is going on?  i have fedora 8.
 
i have a log directory specified, and within it is astro.log and astro.old.
 
what could be causing this to happen???
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