Crash with Dialogs

I have ab About dialog that looks like:

Type (dialog) mDlg

            bret = DlgInit(IDD_ABOUT,mDlg)
            iret = DlgModal(mDlg)
            Call DlgUnInit(mDlg)

Now the dialog box is simple (3 static text boxes and an IDOK button. The dialog displays correctly when asked but it crashes when I hit the OK button. Any ideas?

Brooks V