We are having similar issues connecting wirelessly to our Dlink radio. After the NY Regionals, we figured that there was something wrong with it because we couldn't connect without having it tethered.
I thought there was something wrong with my laptop and i kept changing the last number of the IP address to see if that was the problem.
So We reset the radio and still cannot get it to work. According to the tutorial, All we have to do is reset again and change the "wireless security mode" on page 7 to get it to work?
http://www.usfirst.org/uploadedFiles...adio_Rev_A.pdf