lolz, for everyone having a problem with the laser weapon/grenade launcher.. just don't use the reload/inf. ammo. I never use those for the only reason that the game would be no fun at that point, now it seems like you can't progress with it on. Kind of a smack on the hand now doesn't it. Now play the game like everyone else and scrounge for ammo. It's not difficult to find.
Also, don't give me reasons why having those options on make the game go faster, yada yada, it doesn't make the game move any faster with them on/off. Ammo is abundant on every difficulty. Plus, if you're playing this game on the hardest difficulty and using these cheats, you're honestly just cheating yourself at this point. Be happy with invincibility, that's an option that actually does benefit you if you're only trying to play through storyline without any hickups.
Good day gentle people.