Cannot talk to Dataset!

Ok, I have tried just about everything.  I deployed a report and some datasets to Report Manager.  I have set the permissions on every level (Home, folders, reports, datasets) and added domain users with read roles.  I logon though as one of the users and still, when I try to run the report from Report Manager as that user, it tells me it cannot create a connection to the underlying dataset.  When I run it on my PC it works fine as an Administrator.

What else do I have to do to get this to be readable for them!!!  It was working fine before.  I even added them as logins to my SQL Database, although I didn't think this was needed for my ReportServer DB.

the user I'm testing with is dtest:

http://www.webfound.net/ssms_reportserver.jpg

http://www.webfound.net/sql_login_permissions.jpg

http://www.webfound.net/site_permissions.jpg

http://www.webfound.net/home_permissions.jpg

http://www.webfound.net/reportfolder_permissions.jpg

http://www.webfound.net/report_permissions.jpg