[Orca-users] orca graphs blank

[mvm_8]

Hi All,
         Can anyone help me out with a problem that comes up with 
orca once in a while..my orca CPU usage graphs keep going blank on me 
once in a while and the date stamp shows like 3 or 4 months old. They 
stop showing the latest data no matter what i do..i checked for the 
data in $orca/var/orcallator/ directories and i can see that orca is 
collecting the latest data for the day, but the graphs do not show 
the right data.
Any ideas,

thanks,
Venu