When you are looking at the window and door in elevation view in the tool's dialog box, and you use the ganging checkbox, do the lines disappear as they should? Also -- I hope I am not stating the obvious -- you need to check BOTH ganging for the top of the doors AND the bottom of the transom windows.
There's always Cadimage....
Richard
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Richard Morrison, Architect-Interior Designer
AC26 (since AC6.0), Win10