It's not a real map, and I have a semi-recent backup, so it's not the end of the world if I can't get it back. But I'd like to try. What I was making was a library of all the SFM props. I got the full pack from MaxofS2D, and was going alphabetically through of all the props, deleting all of the ones that cause hammer to crash instantly. Like crossing a minefield with an army of clones! Anyway, somewhere along the way the map lost the ability to be opened. When I try, hammer crashes after a few seconds of trying, and an access violation .mdmp file is created. Any ways I could get it back running? [EDIT] I was able to restore the map by loading it up in notepad and deleting props until it worked. I knew that you could do this, but I pretty much just got lucky and while deleting props that I knew were either redundant or had broken textures, I seemed to delete the problem.