Well, it might be a corrupt image with corrupt exif data. But anyway you should update to the latest version as we indeed can't support such old versions:
As to:
Quote:You should also go to the admin page and start caching all the pictures, because else they will be generated on the fly when you access an album (preview and thumbnail).
Well, for exact that reason it is not necessary to precache and also useless if you use a theme that sets specific image sizes for layout reasons. Then these cached images would not even be used... All info on that on our user guide...