I've had 4Images installed for a few days, and it works great. Only thing is, when I go to "Auto-Thumbnailer", and create thumbnails, sometimes it won't create a thumbnail. It doesn't say an error message or anything, just for example:
"Create thumbnail for: photo (photo.jpg) .... "
But it doesn't say "Thumbnail Created!" like it does for the ones that work. When I go into my albums, this is what I get for a thumbnail for the ones that don't work:

I'd love to know why this happens and how I can fix the problem. Thanks!