I was experiencing the same issue of not being able to save edits and posts to WP and the solutions offered here did not work in my situation.
I found the solution on the post below:
http://www.nologorequired.com/wp/2009/03/27/apache-mod_security-whitelisting-a-file/
I contacted my hosting provider about it, they followed the steps outlined in the post above and that fixed my problems.
I hope this will help others.
Thread Starter
hermit
(@hermit)
Thanks curious1960,
I still can’t log in by going directly to http://example.com/wp-login.php
I’ve also tried disabling the plugin folder (by renaming the folder plugin.hold in the server and adding a new blank plugin folder) and it’s not working.
I experience this problem using Firefox or IE.
Even if I type in the completely wrong username and password, nothing happens … the screen just goes back to the wp-login.php page – no “wrong username/password” message or nothing!