Save game DLC Missing
Today I tried to load up a old save file for Civilization V. The load button was locked and in red letters next to it "DLC missing". The DLC are Germany, Huge map, Difficulty=2, normal game pacing. I think I have all of the DLC of civilization installed and the recent patch. For some reason the saves for another game works perfectly.
The usual cause for this, is that Steam is not online fully - reboot your PC, and see if it finishes whatever steam is up to
Could also be an effect of the new patch, messing with his savegame.