The clams look great. ~In full screen mode on my 2 screens the clams are on screen 2 and the shells move but the mantle is static. When i put MA3 into window mode the clams work fine.
I see the same thing here on my third screen (the same one that had trouble with the purple gorgonia). Here's a side-by-side of screenshots to illustrate...
http://webpages.charter.net/rlsimon/clams.jpg
Multi-monitor hell time again?