Bug - Invalid Checkpoints
I decided I wanted to beat the campaign on legendary. I went through cairo station until near the end when I went to bed. I return the next day to try to finish it and it says I have an invalid checkpoint; that it doesn't match the one on live or something. It gave me the option of restarting the level, or continuing without achievements. This is REALLY annoying because it prevents me from getting achievements unless I play the entire level over again. This happened to me the first time I played the campaign as well; half the time it ended up being invalid, and in the end I never got the achievement for beating the campaign.
I also edited my first post in this topic, added that we need an option to disable mouse acceleration.
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