For some of my non-gog games there is no tile image saved, which is no problem, I just assigned a new one.
In one of the cases however it worked for a few days, then the image would not show anymore, for whatever reason. So
I went to it's media configuration and instead of the preview I see a "could not load image" message.

The problem I face: The UI won't let me assign a new image, the control is locked. Nor can I click the preview image to open a new file nor can I drag one over it.

Is this known? And is there a way to fix it?