I agree, for what it's worth - Crossroads is old, and as far as I know isn't being developed any more. The link I had for it has gone dead, anyway. Bear in mind also that you're dealing with Metasequoia's idea of what a COB file should be, so the opportunities for error are multiplied.

My go-to app for COB - OBJ conversion is usually Compose, but that's old and unsupported too so you may well be faced with a similar problem.

Another thought: trueSpace 7.6 is free. If THAT can't make sense of a COB file, then maybe nothing can...