>>Other form in the project seem to autocenter correctly. But - this one for (mode-less, in-top-level-form, as are the others), opens (inside a VFP top level form) at [almost] top center.
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>>When the autocenter is switched off, the form opens top left. Haven't packed the SCX yet. Any guess as to what might be happening appreciated.
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>My WAG would be some aberrant code that sets the Top property only of the form to some value above center AFTER the form is centered. This code could be almost anywhere in methods that get called when the form is run.

I had the maxtop property set to something other than default (-1).