Sgt_Kickaxe - 6:48 pm on Dec 16, 2012 (gmt 0)
I don't permit hotlinking, it's blocked in htaccess. The sites that hotlink, presumably by scraping the search engines, don't display my images but they do have the url to my image on their pages. This is apparently enough, if this is the cause of my images being filtered.
I've been over my site many times, including fetch by googlebot, and there isn't anything even remotely worthy of a filter on my site.