This is the THIRD time I've got this error. For some unknown reason, whenever I publish OR edit a post/page I'm led to "wp-admin/post.php" and given a 404 error.
The last time this happened I had to reinstall the entire thing.
Every permutation of editing the .htaccess file has been tried and tested.
I'm in desperate need of a solution - this problem has been plaguing me for too long.