>>>The result is no rows shown in the grid. (Not the empty grid you'd get without Safe Select). If I click onto _SCREEN and then back on the form, the grid fills in.
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>IME this infuriating and time-wasting "feature" usually improves if you formally setfocus() to a control away from the grid before repopulating/refreshing it. I don't believe that a toolbar button will suffice; try thisform.btnDummy at -100,-100 whose only purpose is to receive focus. Bring focus back to the grid afterwards if needed.

A toolbar button doesn't take focus, it's designed that way. But yes, I've seen this technique several times, even a dummy textbox with negative coordinates, defined at form class level, whose only purpose is to take focus when needed. I have forgotten when it was needed (except before save, so the current control loses focus and thus forces its controlsource to get updated with its current value), but now that you mentioned it, yes, repopulating a grid would be another good time.

Proven to work - Dragan's help about 10 years ago ;)