realmaverick - 6:50 pm on Mar 6, 2012 (gmt 0)
The image is a max of 200px in width, but usually a greater height than width. 200x340 for example. The ad is 300x250 and appears to the right of the image.
I did have an Adsense rep, who said this layout was fine, this was in early 2011. We discussed these pages in depth, during a visit to Google in London. But he moved to another department and I didn't get assigned a new rep.
The other pages, appear un-effected. The other pages are gallery pages, that list the artwork. These still rank well. Though these pages have zero ads. My entire website is extremely low on ads, which doesn't appear to help with rankings.
The traffic to each download page, even before the drop, was actually low. But as there are tens thousands of them, together they bring in a large percentage of the traffic.
Before the update, we'd rank for lots of long tail searches such as Black circular widget, usually number 1 for thousands of terms, but most are now pushed to the second page or not even ranking at all.
I have gone over and over and over competitors websites with a fine tooth comb. Through their source code even. Logically, they all appear to be doing stuff wrong, i.e lots of ads above the fold, not to mention some of them are made up completely, of stuff they have stolen from my website. Yet I am the only one that appears to have been hit.