overview history performance data does not load !

Hi All,

I have an issue where in the history charts of overview performance data does not load. Realtime overview performance works fine. The advance chart works fine.

It is the overview performance chart for previous day that does not load. No matter how times you refresh. This is happening for many hosts and not specific to one.

Any suggestions on how to proceed. I have attached a snapshot for the same.

I am running vCenter Server 5.5.0b

Thanks