Marten
If it makes you feel better, you are not alone, we saw a similar problem in VFP5 with subclassed forms created in VFP3. Infuriating because it makes no sense.
You do not want to hear this, but rebuilding the form from scratch makes it go away.
HTH
Regards
JR
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1