Setting Transparency

[John Rule]

I was playing around with setting the transparency color of a gif with some
success, but the problem is...the transparency is not always being saved
with the stack. So when I re-open the stack, the transparency color is
usually (sometimes it works) set to another color (i.e. it's not transparent
anymore), and if the gif had any other transparent area, it is not
transparent (some other color). You can also test this by simply flipping to
another card and back...

(My programming example was the 'Easy Transparency' stack)

Any ideas?

JR