If no one else answers, I'll venture a guess. Don't have G3 myself, so this is just a stab in the dark.

I'm curious about what size file you're using. I'm wondering if you took a photo at a higher resolution (i.e., a larger file size), would that make a difference?

Just for the fun of it, take photos of the same item (even in your back yard) at different resolutions and try loading each of them.