My UI uses recount by default but the addon allowed people to subsitute it for Skada.
It just parented SkadaBarWindowSkada to one of my textures then ClearAllPoint() followed by two SetPoints for "TOPRIGHT" and "BOTTOMLEFT".
I'll DL Skada and make sure it still works (no-one has complained to date).
Edit: Downloaded, tested, threw in a SetSize() for good measure and it placed Skada where it should without any problem. Moved/resized Skada /ReloadUI and Skada is back where I placed it.
I do this in a function that is "delayed" after entering world until certain other frames have been created (none of them Skada related) so I don't know if that might be the difference.
After moving/sizing