From: heathrowe on
Interesting, I get the same result as you, too.

As a workaround you can apply the same Blend Mode directly onto the Symbol.

h


From: Grif_ on
well, not really a work-around as i need the effect on a shape in the button
affecting the shape below it.

I'm getting around it by faking the overlay effect with gradient. it does the
same thing with a mask also.

Really annoying

From: abeall on
Yeah, this is an annoying architecture issue, please add your vote:
http://adobe.com/go/wish

You get the same problem with groups within groups, all blend modes revert to
normal. Same thing when you add a live filter to a group that contains an
object with a blend mode. It's an architecture issue.

The only workaround that works sometimes for the symbol problem is to flatten
the symbol contents. You can keep a hidden layer with all your objects so if
you ever need to make edits they are still there, and just use a flattened
copy. But that doesn't always work, of course.