You may want to try the change mentioned here: http://wordpress.org/support/topic/301275 It worked for me 😀
Forrest_Snyder, I think I love you! I tried trillions of other things and it didn’t work at all. This worked right away!
Did/do you use hostmonsster?
I get this as well. I’ved tried 777 and 755… No go 🙁
Thought about that, so I replaced it with a default and still no go. I also don’t think that would cause the wp-admin to not work.
