I don't know where it's catching but I tried to slip a small crescent wrench to lift the latch, I used to do this before when the latch retaining pin used to slip off, but now it does nothing...
![Angry](http://cal-look.no/lounge/Smileys/default/angry.gif)
in fact no matte how hard you push, the button won't move at all, as if was locked (which it isn't, I don't even have the key!)