[mrtg] Problem with refreshing

[mrtg]

I have recently installed mrtg onto an OpenBSD server it is currently logging 7 other servers and one router with 4 interfaces but nothing is updateing i have set cron to reload the run mrtg with the cfg file every 5 mins but the updates on the web page shows the traffic properly (In the text) but not on the graph. 
Details
*Im am not useing a proxy.
*I have refresh content many times.
*I have deleted all png files and reloaded (Seemed to work at first had a few updates on some of the graphs but long term was the same prob)

Any suggestions or help would be greatly appreciated.

Cheers 
Rod

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