demigod retail registration problem

I have been fooling around with this for three days, ever since I purchased Demigod at Wal-Mart.

I have created a Stardock account and installed Demigod.  I was able to update the game (once), and I can start it and play single player.  When I try multiplayer, there is no one listed to play with.

I thought this was related to the multiplayer problems others were having, but now I'm reading that it is working for other people.  So, I tried to reinstall, redownload, and enter the serial again.  Same problem.  But when I right-click on Demigod in Stardock and select "view registration", the key shown is different from the one I entered which is printed on the back of the manual.

I have tried this many times, and it happens over and over again.  I thought I might have something screwed up with my Stardock account, so I created a new one, but still happens that way.

What is going on here with my registration?