DaveS,
I tried your scen file and found it CTD as well. I removed the "Mir" from the scen and it loaded fine. Not sure what the conflict is - but it's with the Mir.
Thanks for the second set of eyes on the issue. I confirmed that it was the Mir vessel that was source and the root cause was that I had forgotten the "STATUS Orbiting Earth" line in the Mir vessel section. For some reason the SSV Mission Editor didn't pick up on this when I checked the whole thing for issues using it's built in checker, not sure if that's because it only checks the actual mission file or there's no sanity check for the "Other vessels" section.
