Don't know if you ever got your issue figured out, but here is what I had to do. I bought a barely used D-link response point system for my business. Everything was in good working order, but after doing the initial upgrade to sp2 and then having a power outage the next night, the base unit became unresponsive. I spent several hours with D-link tech support trying to get it figured out and they weren't able to get anywhere and told me there seemed to be a hardware issue.
As a last ditch effort I loaded the ResponsePointEraseData.exe from the utility folder onto a flash drive. Then I powered down the base unit, plugged the flashdrive in and powered up the base unit again.
This cleared whatever problem had occured and reset the unit. I lost the very small amount of setup that I had done, but everything has been good for the following 3 weeks or so since.
Hope this is helpful.
JP