Yet another solution. A similar thread was posted yesterday Thread ID: 785066 It seems to be an issue with VFP not codemine. Your solution works fine. You can also issue thisform.hide() immediately before launching the child form. And you can issue
_screen.closable=.f.
_screen.closable=.t.

before closing the parent, note it must be turned off, even though it is off, and then back on. _screen.closable=.t. will not work alone, and it should.