Unlike the other geo maps, the region map uses a stored process. The most common reason why the stored process doesn't run is that the stored process is not set to execute on the SAS Application Server that Visual Analytics is using. For example, you might have Visual Analytics running on SASAppVA but the stored process is executing on SASApp.
To check the execution server, log in to SAS Management Console with an administrative account. On the Folders tab, navigate to /System/Applications/SAS Web Infrastructure Platform/Web Infrastructure Platform 9.4/Utilities. Right-click GeographicMappingService, open its Properties and look at the Execution tab.
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