Color Correction Image Effect render screen all grey

When I have a camera with the Color Correction Curves script attached to it and i deactivate it, after reactivating the script causes the Camera to render only a complete grey screen.

Why is that?

The new image effects were released as untested alpha and have many bugs such as the one your having, I am having the same issue which no one has an asnwer to. Best to use the old ones or make your own.