I'm completely puzzled: I have a whole series of images I need to
optimize/reduce, and all three dimensions (w, h, resolution) appear to be
locked, with the constrain proportion box grayed out. I'm using FW 8 on a Mac,
and this appears to be a fairly recent problem. What ridiculously simple
solution am I missing here? And why might it be happening with images I've
received from others? I've optimized many images in the past without incident.

Thanks for any !