Glad you found the issue and great advice Fitzcaraldo....Alot of us have gone through this nightmare so there is alot of collective wisdom with reagrd to this issue
more and more it seems these CTD on save issues are mod related or RAM related, I think the whole business about not saving near land or near enemy ships etc can be disregarded. In my case a CTD on save that had been plaguing me for a long time was finally tracked 100% to a MOD conflict, and not in any way to do with where I was in relation to oher game elements when the save ocurred.....
