A few questions:
1. What version of CAPM are you running?
2. What sort of timeframes are you trying to view said report at? Last Week, Last Hour, etc?
3. Does the user you are creating and viewing this dashboard/report as have this setting in their user role:
Run Dashboards at Higher Resolution
Lets users select higher resolutions when viewing dashboards. No roles are given this role right by default. Users with this role right can set and save the resolution to higher values than are typically allowed when reporting for longer time ranges. When users save the higher resolution at the tenant level, it is only visible to users with this role right. To view the current report resolution settings, select Administration, Report Resolution. The resolution settings cannot be modified on the Report Resolution page.
Role Rights - CA Performance Management - 3.6 - CA Technologies Documentation