Just tested wifi 'N' on both UR and DW images, worked spot on, on both.
To setup correctly follow this: -
Press Menu > Setup > System > Network > Select Wireless > Scan Wireless Networks > If 'enter hidden network SSID' appears first you must WAIT for scan to finish.
Once scan is finished select your network > Set use Interface to yes > Set your encryption type as set on your router > Enter your Encryption Key and press ok. All done