You should try the same rewrite rule for the images they seem to be intercepted by some rule you have. Andy posted one he uses where you have images redirected to images like your css redirect...
John
Edit this is from Andy's post :
RewriteRule ^images/(.*) images/$1 [L]
http://www.gossamer-threads.com/...i?post=264001#264001
Significant Media
John
Edit this is from Andy's post :
RewriteRule ^images/(.*) images/$1 [L]
http://www.gossamer-threads.com/...i?post=264001#264001
Significant Media