Posting images triggers "You have been blocked by Audiogon" page

Hey all.  I know how to insert images into posts, but for some reason despite using a few different photo hosting sites (flickr, Imgur, etc), when I insert the image url, it will show in preview for the post, but when I hit "SUBMIT" a "You are being blocked" page comes up.  I don't think I have any erroneous extensions or blocking software anywhere on different web browsers (mac), but something specific to Audiogon is not ok with me.  Any ideas?

Thanks!!