THANK YOU DOLEMITE!! This really helped me. I deleted the cookies relating to this website and all is well.
All of my WordPress websites are subdirectories hosted by GoDaddy.
Earlier today I updated one of 4 sites to 2.6 using the WordPress Automatic Upgrade plugin. I thought I had not followed the instructions properly at the very end. Fortunately, my friend and WordPress mentor told me to download 2.6, upzip it and reload wp-admin. That worked. AND I had to re-activate ALL of the plugins.
Even after that armed with the wp-admin fix, I felt confident that I could update the other sites, however, I decided to take try it out on one other less active site. Good choice. I experienced the SAME issue and this time, the wp-admin fix DID NOT WORK.
Which led me here. I can see I’m not the only one.
