>Stephane,
>
>Are these the MS ActiveX or some other third-party controls?
No there are MS from VS SP3

>Are you sure they are the latest versions?
SP3 is the current version of the controls

> VFP5 or VFP6? Does the crah occur on the opening/closing of the second form ~20 times?

That's right

>Does the first form stay up the whole time?
Yes it does

>What if you for testing purposes provided a regular VFP command button to launch the child form and see if that makes a difference.

Did that already, same problem, so the calling form is not the problem

Thanks a lot for trying.