Open the dialog in the installAware Dialog editor, select the Vista Glass control and then in the object property panel (... on the left of IA dialog editor IDE), modify the "GlassEnabled" property to FALSE.Where can I find this setting? In the Dialog?
But why are the black bars only on two dialogs and not at all?
Without having your dialog is not easy to say, but probably this could be caused because you used a "Vista Label" control or by a control property conflict.
You could compare the controls properties with the ones of the other dialogs, to see if exist any difference.
Regards