By the way: I'm using evocamp skin.
1. Which file do I have to modify to have pictures in archive-, category- and tag-pages?
2. And how do I get a single post with the title linking to the post URL?
Hope to be a bit clearer ...

I could fix the problem with the photos in the blog settings - they had gone after the update.

But I still have not Link to the post title even though I activated that in the SEO tab in the blog settings.
(Post titles: Link to the permanent url of the post)
Why doesn't it link on the blog post page?

@foodie wrote:

Why doesn't it link on the blog post page?

Because you're probably not using a stock skin and your custom skin doesn't implement this in the "correct" way for this feature to work.

I'm using evocamp. Updatet everything. Then customized the style.css. I just checked the folders if there are any old files in there - not a single file is from the previous version.

I don't even get the post title linked to the URL if I specify it in the editor. The link then appears below the head section (see screenshot). But I do get the title linked to an URL in preview modus. It then links not to the actual URL but to the post-id (e.g. "p1234")

Ah, thanks for the screenshot. This actually looks pretty normal to me. I think at some point we decided it didn't make sense that clicking on a blog post would sometimes link to an external site. The behavior was not consistent and predictable for users and some people didn't like it.

Don't you think it makes more sense that the user sees the external site before getting there?