value of width and hight are not correct.
Close AECOsimBuildingDesigner
Change Regional and Language Setting (Windows)
Change the Digit Grouping Symbol from “dot” to “comma”
Restart AECOsimBuildingDesigner
Another possibility is to rename the user Stair Preference file. (Only in combination with Solution1)
Please have a look to this folder:
C:\Users\Username\AppData\Local\Bentley\AECOsimBuildingDesigner\8.11\......\prefs\
And rename this file:
BuildingDesignerStairPropertyPreferences.dat
BuildingDesigner is the MicroStation User Name.