Since you’re unable to edit posts from an author with the same user level as yourself, raising everyones level to 10 didn’t help me… And even though I’m not very proud of myself for hacking into the code, there’s a simple hack to solve the issue.
I haven’t done any thorough testing if this has other consequences though, but it seems to work fine for me (running wp 1.5.1.2)
in wp-includes/functions-post.php, look up
function user_can_edit_post (at about line #358)
|| ($author_data->user_level > $post_author_data->user_level)
on this line, change > to >=
