Suddenly notifications don't work anymore.

I'm not sure about images, I would have preferred to see them whole in the newsfeed.

The new theme of the site looks and runs cool, but the pictures are displayed zoomed in and in part only. And the skull returned at the bottom of the page ...

To edit your Cover and Profile pics you can change them in one of two ways. Both are done on the profile page, either by hovering over the Cover image and finding the camera Icon in the upper left corner (lower left on profile pic) and selecting it. Or thru the "Edit User" option. Then choose the Avatar Cover option.