If I go admin > Manage > Posts and pick one post from the displayed list, it opens the post for edit but in the Preview window there is always a Page, actually the Archive Page of the theme. Even if the theme doesn't have an archives template (like Classic) it will try to display a Page titled Archives in the preview area.
Same thing happens if clicking the "Edit this" while viewing the blog.
It does NOT happen if I open for edit my or others' drafts.
Pages also show up correctly in the preview.
Is this a bug or just me?