In case anyone else runs across this issue, I've found a solution that worked for me.

Look at your master palette. If you are using a master that is set up as spreads (even if you're only applying one of the pages in the spread), delete the other master page in the spread (right click, delete master spread).

Now you should have a single-page master and your button should work.

Don't ask me why. I have no idea. But, when I read the post above, I thought the spreads might have something to do with it and gave it a shot. . .

Hope this helps someone!