I suspect that you might have installed Analysis Services on a server
set up as a Win 2000 Domain Controller. To my little knowledge, you are
not supposed to run analysis services on a domain controller.
I have faced similar problems long ago, and then I reinstalled Win 2K
Server & just skipped the server configuration and then proceeded to
install SQL 2K and AS. Then I was able to browse my cube and dimension
data without any problems.
Hope this helps.
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