How can you see if you are using WebI Rich Client in 2 or 3 tier mode? Just hover over the Connected label in the bottom right of your screen.
2 tier mode:
3 tier mode:
When you start WebI and click the down arrow in the System box on the logon screen, you see lines starting with a computer icon and a globe icon. A globe icon means you start in 3 tier mode. A computer icon results in 2 tier mode.
You will only see the globe icon if you started WebI RC at least once from BI Launch pad!