Quick question - you mentioned the "Control Surface is long gone" - did you mean the definition of it, or the actual device?
I don't actually have any control surfaces that I use, for several years now, because even though my upper midi controller has 8 faders and a bunch of pads and knobs and transport controls, it is too far of a reach to be comfortable, so I just quit using them a long while ago and use the mouse or key bindings.
I did just take a quick look in Preferences, and under Preferences>MIDI>Control Surfaces, there is a red X that allows you to delete a defined control surface. Have you done that?
Also - it appears that default Control Surfaces are stored in: C:\Program Files\Cakewalk\Shared Surfaces, so maybe you could remove the one you want to do away with there?
Bob Bone