I would have thought the "roster or data/sea" mods add more ships etc not remove or rename any, I may be wrong here but why would Campaigns run fine with the modded Campaign_SCR.mis files, the other single player missions run ok, just this one.
However if the problem is something else I would love to know what!
I'll wait for other suggestions before I remove the roster/sea mods as that is not going to be easy!
Thanks.