I know this is on five year old hardware, but this bug should be easily fixed.
Every time I switch weapons, see a nanosuit message (low health, energy. etc) I see a blurry ghost image of my hud right under my hud, and under the messages.
I can deal with the framerate, but this bug is just really ugly.
Also, it freezes alot during campaign. I really hope they bring out another patch soon.
Oh, and the laser sight is kinda bugged too, when you equip it, and switch weapons, and then switch back, the gun has iron sights AND laser sights, really messing up the feel of the attatchment.
Otherwise, this game is **** fantastic, I'll be playing this for the next year.