can't get some sociable icons to show

I’ve had this problem for some time. In IE and FF quite a few of the site icons posted by the sociable plugin show as just text only (no icon) even though the icon image is uploaded and can be viewed directly. In chorme they just show as blank boxes.

those that don’t show also do not link to their respective site. they just link back to my blog’s home page. I’m not sure what to do or why it’s not working. here is the blog so you can see what’s happening:
blog.pcpandora.com

sociables 3.5.2
wordpress 3.0.1