Cannot use keyboard???? HELP

[Edsi]

Hello, i'm having trouble with the game...i install it then i can play the story since i stop...if i close amnesia then i re-open it i cannot use any letter from my keyboard, ( i use a wirless one... ) just numbers and stuff like: - caps, return....
so i cannot play and this is very annoying also beacause i bought the game!
so if i play with the default keys ( W A S D ) now i cannot!
please help me...it seems like if i have wasted 15.00 $....

I use a mac ( Lion version ) with a wirless keyboard and mouse made both by apple. thanks