I've been playing on the stable release of 0.9.507 when I made an aircraft that that used wings clipped inside fusalages to have cooler wings. When I updated to 0.9.508, the control surfaces on those wings did not work anymore, I was able to see consistently that they did not affect the movement of the craft at all, after retoggling all of fusalages occlusion settings, they returned to normal. PS: can't really get good images for this one, haha