>I have a form that is called from the .Click event of a command button on another form. Sometimes this works fine and sometimes I get a Fatal Error C0000005 when the DO FORM occurs. The form being called is a large multi-paged scrollable form, if that matters. I am using VFP6 SP5.
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>Any ideas or known issues on what may be causing this to occur?

Does this message show, which method gives you the error? Do you have all objects in this form in design time or you add them as necessary in run-time (delayed instantiation)?