don't know if anyone experienced the following issue:
see attached jpg,
left is the window family which is OK when flexing within family editor.
right is the one after loading into project, constrain lost when flexing, but no warning at all.
the window pane is the nested family.
anyone have idea what normally causes such problem? i mean
1) flexing is OK in family editor
2) flexing is not OK sometimes in project level
3) no warning of constraint lost
thanks.