I think someone has already had a similar problem to me, but I have other issues going on as well, so I created a new post.
I've been very happy with the ImageMapper plugin, however, a couple colleagues have pointed out to me that the image map areas are not matching up with the corresponding image underneath to a large extent.
The problem seems to exist in Mac OS X 10.6 & 10.7 - fine on 10.8.
I cannot get this to happen - I've tried it out on an iMac, Macbook (15" & 13") and iPhone 4S - all fine for me. I've also tried it in Safari, Chrome & Firefox; still all fine.
Do you have any idea as to what could be causing this?