Mine does the same thing, too. Very hard to get it to unlatch unless you hit it in just the right spot. The button itself hinges from one side, I can't remember which at the moment, so hitting it in jus the right spot will usually do the trick, but it's a pain in the neck. The way it's designed, there isn't really any good way to take the latch mechanism apart to see what' really going on. The other problem is that the 60/40 bench option is pretty rare so finding replacement parts is next to impossible. In my case, I've come to accept that this is one of those annoying things that I probably need to live with even though I hate it when things like this don't work right.