Camera in movie mode, Crop movie = ON... video works fine.
Suddenly I like to take a photo... Switch camera to photo mode, focus, press shutter... oops... press shutter! Press harder!... Hmmm, no photo!
Go back to movie mode, Crop Movie = OFF
Photo mode: Press shutter... works fine again.
To be short: You can't take photos when switching from movie to photo mode, while using Crop movie.
EDIT: Used satriani's ML_N_04.08.2013
By the way... Thanks for the update(s)!