Maybe I'm wrong: but from your log, it sounds like the game has issues at loading some particular image. I suppose it has some hidden info which makes the loading function to crash.
A possible solution would be to remove the hidden chunk from the image, except that I don't know which is: the one you have selected? Or some pic in the folder you're browsing? Maybe you could empty your folder and readding the images one by one
Here a tip to convert png images in bulk.