PlayOnMac can't run because of a bad language settings on your computer.
To solve the problem, open a terminal and type :
defaults write -g AppleLocale en_US
I did that and nothing happened
I had the same problem too, I looked around and found that it should be written like this without the space:
However, even after I did that i get a message saying:
Rep argument is not a dictionary
Defaults have not been changed.
Does anyone know how i can fix this?