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Created attachment 2088 [details]
Please see the attached screenshot. This happens when moving many controls around in the Document Online panel. In this case I was moving a LinearLayout.
I'm fairly sure this is related to bug 5286, linked below. If so, it's marked as fixed, what version of MfA are you using?
When you drag a widget in the outline panel, a preview of the widget is used as drag icon. If what you drag is a big empty layout, you may end seeing that black box. This is not very intuitive for empty layouts, so I'll change that behavior for empty layouts.