EV Override black screen when launched

I have a 27" iMac with 2.9 GHz Intel Core i5, 8 GB DDR3 memory, Nvidia GeForce 675MX graphics card with 1 GB GDDR5 memory and OSx Mountain Lion. I recently installed EV Override Version 1.17. Why do I only see a black screen when I launch the program? Need help. Thanks.
