I'm also trying to connect to oracle essbase. The usual method in our organization is to use the SmartView add-in in Excel. I can connect via excel, but cannot via Tableau. I'm using Tableau desktop v 9.0 and the driver i installed is tableau9.0-essbase-driver-x64.msi. A look at my Windows 7 "programs and features" shows that the Tableau 9.0 (9000.15.0318.1720) Essbase driver is installed. when i attempt to connect is just "hangs" and shows the elapsed time as 2 minutes until I killed it.