None of my save files, autosaves or manuals, will load on Chapter 4 (Stronghold), except for the automatic one at the very start of the chapter. Every time I try to load a save-file on this chapter, the progress bar gets about 3/4 full and then freezes. This result happens whether I am loading from the main menu or within the level.

Has anyone else had this issue and knows how to fix it? I was quite far in to this chapter and I'd really hate to have to start it all over again and play the whole thing without being able to save...