Salesforce Roll-up Summary Field is Still Calculating

To resolve the spinning hour-glass icon on a Roll-up Summary field, first verify whether  Advanced Currency Management (ACM) is enabled in your org using the navigation paths below:

Classic: Setup | Company Profile | Manage Currencies
Lightning Experience: Setup | Company Settings | Manage Currencies

If ACM is enabled, roll-up summary fields that calculate currency on the Opportunity object will be disabled and will no longer calculate values. This is expected behavior when ACM is turned on.

To re-enable currency roll-up calculations, you would need to disable ACM — however, note that disabling ACM may affect other currency management features in your org. Review the implications carefully before making this change.