Hello all,
While playing the official campaign, I noticed that if you try to "resume" the last mission while there is no saved game in that mission, the game loads a save from the previous mission. So you have to use revert instead of resume in that case. I would suggest either to remove the resume button or the make it do the same action as revert when no saved game is available. Although, sometime revert is not available and then resume works fine, so not always reproducible.
Regards,
Chris