I am stuck in the mission where I need to pick up the Sniper Scope. After I pick it up the mission will not advance and the HUD text still say I need to pick it up.
No, I wasn't aware of any mods. This is a new, clean install.
Try restarting the level and waiting until all the dialogue finishes before you grab the rifle. Sometimes if you grab it too fast the door-breach trigger will fail to initialize.
It does show that I pick it up, but then it goes back to say I still need to acquire it.
Finally got past it. For some reason I kept picking it up automatically. It finally made me use the 'F' key.
Let me guess, you were using the "loaded" Cheat?
because thats what happened to me my first time around.
when you use that, you get the sniper, and it picks it up automaticly as ammo.