Page where issue occurs: http://www.mymythos.org/category/mythos-journals/
I've got posts being pulled in using WordPress MU Sitewide Tags Pages, but the images are broken. It's possible I may have narrowed it down to this line in the htaccess:
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]
For example, on your front page,one of the failing images is sourced like this;
But the images which don't fail are sourced differently, like;
But image url for the rose works: http://www.mymythos.org/theevolutionoftheinnerme/files/2010/09/PurpleRose-300x255.jpg