Okami - Black lines on screen MAC

[Daibouzu]

It's not my picture but this is an exact representation of the problem.
Black vertical lines on the top layer of the game making visibility impossible.

I would install bootcamp, but I really don't have the HD space now, nor do I own Windows 7.

Do all MAC have this problem with Okami?
Is there a work around anyone knows of?

Thank you.