As a reply to myself, it seems that part of the problem we are observing in our DatawatchES system is redundant Data Security Filters. When in the Rights and Privileges/User Groups, and looking at the User Group of Clients where the Data Security Filters are not working (showing all possible clients), I observe multiple Data Security Filters, of exactly the same name, in the "Available Data Security Filters" selection area. Scanning through all of the Clients, there are three that have this issue. Examining the Data Security Filter list in the Source area of the Dashboard Designer, there are no multiples. This is a really big issue because of a breach of data security.