Mouse cursor stays on screen

[adamZero]

I have this issue as well in the Steam version. I'm downloading the demo right now.

Stats:
iMac 11,1 2.8 GHz quad-core i7 running OS 10.7 "Lion" latest
ATI Radeon HD 4850
12 GB RAM, 1 TB HDD

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This happens for Steam versions of Amnesia: The Dark Descent as well (and I should note that the original game I tried this on was Penumbra: Overture).

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I've confirmed that this happens in the demo as well. I suspect that it's something to do with a new version of OS X... when I first got the game as part of the Humble Indie Bundle, I don't remember having this problem.