problem: Krita crashes (segmentation fault) when user selects File > New
In the new image dialog UI file wdgnewimage.ui, there is a KisColorButton cmbColor that has 2 dynamic properties: color and defaultColor. These 2 properties are of type KoColor, but the UI file passes QColor when setting up the UI.
My solution was just to remove the dynamic properties from cmbColor from the form editor. A KoColor is passed on somewhere later on.