Try deleting /data/misc/wifi/wpa_supplicant.conf (or similarly named file) with Root Explorer, then reboot. And then try again.
Problem is caused by faulty drivers conflicting with Wifi service. If problem remains, use CWM and factory reset.
This is not unique to GingerDX, but rather is nearly universal on all GB kernels.
--When something doesn't work, just try again. Or switch to MiniCM7/9.--
Create an empty text file and replace wpa_supplicant.conf with it.
Place this in the file:
After that, make sure all perms are set (including RWX for all users) and try rebooting.