when reworking the drag & drop handling in the plugin, i finally found the reason (and a solution) for this: it happens as soon the viewport gets minimized.
to keep the viewport above daz studio when minimized, it needs to change the type of this window to something different and back when it gets restored, and apparently Qt (the framework) is losing drop-ability for child elements (= the image in the viewport) when this happens.
to avoid this for the time being, you should avoid minimizing the viewport...
problems with dropping mats to the viewport
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