Amnesia The Dark Descent Demo problem

[Vince]

I had a similar issue. After getting up, I pressed "I" and the game froze (with hourglass-cursor and everything) for like five seconds. The same with opening the main menu with "esc" after that.
Pressing "I" again after that just worked fine. Maybe it is a issue with caching something? Or my fragmented HDD?
I just started a new game and the issue is gone, by the way.
Maybe this helps.