Black iTunes Issue Need Help Fixing It

I recently copied one of the digital copies over to my computer and when iTunes open to enter the redeem code for the movie, the iTunes window turned black. I didn't know if this was something of special effect by the movie or iTunes. I have restarted the computer twice to fix it but no luck. Picture attached to see what I am talking about. I want to to go back to normal. It is kinda cool but I don't like how it looks.