Another find on this, when disable staircases is selected, the staircases will appear, but will work only if the 2 smaller ones appear. But if disable staircases is not selected (which is what I wanted) which ever staircase appear, big or small it works. Conclusion: disable staircases doesn't have to be selected for gsx walk-in to work. But if it is selected, the staircases will still appear, which is what would have to be corrected. Hope it helps someone.