Sabrekiller, when I first got mine I thought I was having the same problem as you. It turned out that I was pushing the sear lever down too far. You only have to push it down easily until it stops.
I was pushing it down and jogging it over and it would go down further, and it wouldn't release the slide. I tried stopping before the 'jog' and it works fine.
I'm not sure if this is your issue or not but I thought I'd throw it out there.