Rotated PDF Doesn't Save State? For some strange reason, when I rotate a PDF using the trackpad (Two finger multi-touch rotation gesture.), there's no option to save it and all changes are lost after I close it.

(The save button is grayed out.)

What am I doing wrong?
... Never mind. Apparently rotating using the trackpad of a PDF in Preview is just for cosmetic purposes. You have to rotate using +L or +R or within the Apple-bar menu. Only after that, the save option will be available. :| 

Strange.