Had the same problem.
After downloading FXR Wifi Fix and Rescue, I still had the white wifi icon. I decided to reset my router and set up my network again and I now how have a blue wifi icon. Yay.
On another note, I have a really odd issue with when I turn on my wifi. If I have a good phone signal when the wifi is off, as soon as I turn the wifi on, I lose the good phone signal. Turn the wifi off again and voila! Good phone signal again. Any ideas on that?