my stair file has been crashed again and again , how do i solve , only stair making

Hello Furrukh, 

From the video i can see that you are using V8i SS5, is it working fine in other file? 

Regards,
Alifur

yes working other any file , problem only making stairs..

Hi Furrukh,

Can you please upload your problematic DGN file with us in this link?

Regards,
Sayan Acharyya