I upgraded from 152 to 154 this morning and am trying to clean up the website. After using the define pages editor under tools to modify certain pages, I click on the save button at the bottom of the page, I get the following:

http://www.mywebsite.com/admin/defin...hp&action=save

and a blank screen

If I then go to http://www.mywebsite.com/admin by erasing the rest of the line, everything is erased on page 2

Before someone says something, that is not the name of my admin file or my website.