Hi ns100,
I think you can look into the following articles and check the dynamic security settings, please see:
Security in Analysis Services 2008 R2 and BISM:
http://technet.microsoft.com/en-us/video/security-in-analysis-services-2008-r2-and-bism.aspx
Dynamic Security in SSAS Cube:
http://blogs.msdn.com/b/azazr/archive/2008/08/15/dynamic-security-in-ssas-cube.aspx
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