I had the S6 Wi-Fi module, which requires an extra capacitor to handle the in-rush current requirements. I sent it back in exchange for the S6B, which doesn't require any board modification.
I got the S6B in the mail today. I wrote a blank program to the Arduino, connected the 9V adapter, connected the S6B, and I still can't get it to connect in X-CTU. I measured the voltage of the Vcc pin and it reads 3.3V even with the USB cable connected so that is a good thing. I don't know what else to try.