I have been using WP for quite a while and all of a sudden this week I have been having a bizarre problem wherein out of nowhere when I try to access WP-ADMIN or use Press It or even posting from the main Write page the program will go to the login page, and then if I enter the pw I get a 404 error and then, evenutally, I can get back to where I want to be (this has happened to people trying to comment as well--they are being asked to login, but I do not require registration to comment). It has also happened to me on multiple computers.
It is especially annoying because sometimes when I hit the POST button the LOGIN screen pops up and the post I was writing is lost.
Has anyone else had this problem? I am getting concerned that this is some kind of major problem with WP and it is concerning me that my blog is at risk of crashing.