> Anyways, the NODEFAULT thing is still the culprit. I just can't find what I am missing here. We already deployed a lot of copies of our apps compiled in SP3 but the behaviour is fine. The SP4 did something about it I guess.

I still can't reproduce any probelem, or find it in an app - and I use Queryunload on every single form. There must be something else wrong...

Did you try my test? Just create a tiny new form, put Nodefault in Queryunload, and run the form.