I just got a new computer, and am using Windows 7 for the first time ever. When I try to edit the MAINCFG lump in SRB2 Doom Builder, it acts like it doesn't have cmcs21.ocx, even though it's in there.
I did select "Run as Administrator" for SRB2DB, by the way.
I did select "Run as Administrator" for SRB2DB, by the way.