404 when trying to edit pictures

I recently upgraded to 2.7.1, and now I realized that if I go in to old entries and try to edit the picture is them, it’ll send me to a 404 page

I think the page it’s trying to reach is:
https://www.xxx.com/wp-admin/post.php?action=edit&post=287

I’ve tried to change to another permalinks setting (I already had default) and then back to the default one, but that didn’t help.

However, if I choose another permalinks setting than the default one it’ll bring up the blog in that mini preview window and it’ll say 404 oh, no your entry could not be found blabla, whatever the default wordpress 404 says when it can’t find stuff. If I have the default one I get the web space 404 message