I purchased a Edimax EW-7811Un wireless USB adapter (http://www.amazon.com/Edimax-EW-7811Un-Wireless-Adapter-Wizard/dp/B003MTTJOY) for my raspberry pi,
Setup:
With the ethernet still plugged in, I remoted in and used the WPA_GUI tool (shortcut already on the desktop). I was able to connect but when I tried it with the ethernet disconnected, it didn't work.
Long story short (after lots of troubleshooting), I needed to save the configuration in the WPA_GUI tool. It's been working since.
Another possible cause of the intermittent problem is with the usb hub (d-link dub-h7). When plugged into the pi, the pi would not start and when restarting right away without the usb hub, the wifi adapter (usb) wouldn't work. I suspect that power from the usb hub was causing the fuse to open for a short period of time, rendering the usb port inoperable until it closes again.
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