@thewildrover, interesting. I recall that occurring in earlier versions for me. Clicking another photo and coming back always seemed to fix the issue so I never really thought much about it. I will add my images typically come from a Nikon (D7000) but from time to time I also edit iPhone images as well. And, I am using the File Browser to avoid being messed up by Apple (ie: Aperture mess).
On a side note, it would be wonderful if the File Browser could be integrated with the Photo Library.