Short description of error
Recently the Blender Native Fullscreen Mode got disabled in favor of OSX Lion Native Fullscreen Mode. This is a big Mistake for Multi-Screen Setup, as the OSX Native Fullscreen Mode does make other Screens unusable by render a Pattern on this Screen. (behaves like this before 10.9!)
Thus make it impossible to have anything else on any Screen than Blender. I Have reported this exact Issue about 1.5 Years ago, and Ton added the Blender Native Fullscreen back in then and agreed on this issue.
Now again it's removed.
I really really don't think this is a good idea - If anything is dropped then the OSX Native Fullscreen!
So why can't we just drop OSX Native Fullscreen and leave Blender Fullscreen in there?
Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps