Ugly black squares on window title bar in Pluma

Strange looking squares appears in the title bar when make window narrow. Making windows wider remove it. Happens in Pluma :face_with_monocle:


Long shot idea but you could try the marco compositor in Mate Tweak window settings.

Window manger is set to Marco(Adaptive compositor) and this still happens

On which Ubuntu MATE version is that and do you use any graphic cards like nVidia, AMD or hybrid? If so, maybe a driver is causing the issue...


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I see Ambiant-MATE-Red is being used. Does this happen on regular Ambiant-MATE, or any other theme?

It happens on all Ambiant-Mate version so i think is not theme specific. This happens only on this specific machine when I switch to another computer with the same theme and settings the black squares are gone