Maybe a missing DO EVENTS after DO FORM yourform?

>Hi all,
>
>I really need help with a frustrating issue. I have encountered a distinct difference when
>running a form inside my development environment verses as a stand-alone .EXE.
>
>More:
>
>Inside a method of a non-modal form a user can click a messagebox "Yes" and another (simple)
>modal form is called (from within this method).
>
>Now, in the development environment (_VFP.StartMode==0) this second modal form appears for the
>user just as expected.
>
>When I run the .EXE stand-alone (_VFP.StartMode==4), the modal form is, in fact, called, as
>verified by a wait window in its INIT. The form, however, never reaches the ACTIVATE event and
>the form is released.
>
>After hours of investigation I am still
>1) Unable to find my problem and
>2) Surprised to encounter such a runtime vs. stand-alone difference.
>
>Help! What am I missing/forgetting? Thank you in advance.
>
>Spence