Well, the project you sent me seems to just be the Ace conversion kit rather than your actual project. Regardless, I deleted King's Tilemap, added XPA Tilemap in its place, changed the resolution in its configuration to [640,480], threw in the DLL of course, and made an event that turned on the fog. Worked perfectly fine.
Also, I don't think this is the most recent version of the kit as I don't see the Window Padding and the fix for custom fonts.