i havent tried nulldc in a long while with Hyperspin but i believe hs writes to the config file to the "default" game line and when it start... it loads from there. I believe that line had to be clear on the setting file and also that option to load from a default image needs to be selected.
its been a while so i can be totally wrong on this..
check in the scripts section on the forum to see if there is any special instructions for nulldc