Why winder stairs dont work properly?

[Ustunes]

Hi guys.. I'm new at Archicad, but I'm used to working 3d softwares.. I have a few question about winder stairs in Archicad.. 

I cant correctly create any U-shape winder stairs. Generally, my solution I do is quite simple..  I draw a stair in any boundry i defined, and then I click any edge of baseline of stair > auto-opened pop-up menu> select segment type > winder with equal goings.. So, Archicad offers any proposal for me. I select any of them.. Unfortunately, this solution dont work very well. Firstly my control on stair option obviously very limited; Secondly, I have many errors in 3d & sections.. I need help for U-shaped winder stairs.. 

[Barry Kelly]

If you are worried about the curvy underside of the stair, unfortunately this is just how it is with winder stairs.

Landings can have a flat underside but not winders.

Here is one of a few posts where it has been mentioned.

https://community.graphisoft.com/t5/Design-forum/Curved-Stair-issue-with-construction/td-p/283945?f=...

With corner winders you can split the structure or model separate parts of the stair.

I am not sure how you would flatten the underside of a stair as you have shown it if that is what you are wanting to do.

Barry.

[Ustunes]

Thanks for replying, Unfortunately, my problem isnt underside of the stairs, my problem is undefined volids in my stair in 3d. There is a mass but its unseen on there. The blue contour line define all solidity for stair, but in 3d I cant see there (only void btw slab&stair) unlike 2d plan view. 

Note:I marked it in additional screenview with red circle.

[Barry Kelly]

Check the connection for the bottom of the flight

There are many different types of connections and you may have an offset active.

Barry.

[Ustunes]

Thanks a lot sir, I have fixed the problem with your mentorship. However, I recognize that I couldnt modify any option with Ctrl+T_ToolSettingsForStairs, If I wanna change anything. My solution works on only redraw stair from scratch. I have an another modifiying problem with Ctrl+T_StairToolSettings. For instance, I try to adjust FloorPlanDisplayLayouts, but it doesnt work. 

Note: I try to adjust FloorPlanDisplayLayouts, but dont work in Video I recorded. 

[Barry Kelly]

I am not sure why CTRL+T is not working for you unless the shortcut has been amended in your Work Environment.

You should be able to open the settings through the button on the info box.

Barry.

[Ustunes]

I fix it as I transfer all my drawings to another new Archicad page with Command_Copy. However, sometimesarchicad  still dont react for the changes I did in ToolSettings(Ctrl+T). I dont know why.. I'll carry on & inform you.. Thanks a lot..