OpManager Reports

When I try to display any of the following reports for Today, Yesterday, or Last 7 Days, I get a "No Data Available" message:

* Servers by CPU Utilization
* Servers by Memory Utilization
* Servers by Disk Utilization
* Servers by Rx Traffic
* Servers by Tx Traffic
* Servers by Rx Utilization
* Servers by Servers by Tx Utilization

For the most part, the data on the snapshot screens is fine and when I test the SNMP monitors, there is no problem. SNMP is running on the devices.

Which MySQL table should I check to verify the data is there? Is there something else I should check?

Thanks in advance.

Walt