On start page (all) cards with image tag in teaser work fine. Choosing a category to select those cards belonging to that category the image-tag shows up instead of the image.
So I presume that this bug has nothing to do with the skin, because it happens only when choosing a category. In widgets ""Featured Posts" in container "Front Page Main Area"" I have set display fist post picture. I repeated this for "Simple Post list" in container "Front Page Main Area" widget. But that does not work.
I cleared browser cache. nope.