I've had the same redirect problem plus other issues that might be related. My blog is showing special characters at the end of some, but not all sentences.
I addition, I am not able to enter or edit a blog. I have a new reinstall and yet it did not fix the problems. Below is a list of problems my tech person was trying to resolve. These problems began about two days ago or late on June 6th.
I still can't get the visual editor to show up. In fact, I can't get really make any changes. I can't add a user, can't change an existing user (your profile is where you can enable/disable the visual editor for your login), can't update a post, can't add a page... they all give a variation of the same error now that says "your attempt to (fill in the blank)... has failed, please try again". It's like we can't make some changes to the database, but I was able to do activate and deactivate plugins. You can do them one at a time, but not bulk. Strange.