When i only want to edit the preview image of a brush-preset the button "Overwrite Preset" stays grayed out. When i change an attribute and than change it back to it's initial value the button is not grayed out anymore and I can overwrite it and change the preview-image.
Hi Tobias, You're correct... I'm not quite sure how to solve this though. Did you know, btw, that you can open a kpp file in Krita and edit it in the main canvas?
This is resolved in 4.0 with the whole brush editor cleanup. I am therefore closing this bug. If you can still reproduce it in 4.0, don't hesistate to reopen it!