OpenGL fullscreen OS X 10.7 Returning Errors

I'm trying to implement a program that takes a snapshot of your screen & saves the snapshot on your desktop. This program worked fined on 10.6 but when I imported it on 10.7 I get "invalid fullscreen drawable" error on runtime. I downloaded a sample program from App开发者_如何转开发le that does exactly the same, using same method etc. & same result...considering Apple's sample program hasn't been updated for a long while (Last revision was in 2008!) do you know if something regarding full screens & OpenGL changed from 10.6 to 10.7.

PS Taking into consideration the fullscreen apps feature in Lion there is a very high possibility something changed, but what exactly is what I'd like to find out.