I don't really know anything about how images are handled, but (from your vbulletin.com post):
Code:
The image sizes set in the config.php are much larger than what the uploaded images are on my site.
and according to the comment in config.php
Code:
// Images that exceed either dimension below will not be resized by vBulletin. If you need to resize larger images, alter these settings.
so maybe you should *reduce* those dimensions in your config.php. (Or maybe the comment is wrong...)
ETA: which version do you have installed? It looks like maybe the values in config.php aren't used in version 4.1.8
Would you be willing to attach a zip of the original images in the album you linked to, so I can try uploading them?