Cookie Error message when trying to login

I ran into the same issue. However it can be logged in after second try.
Also, when I log out from the dashboard, I can still access wp-admin, just as if I never logged out. I guess this didn’t clear the cookie properly?

Has anyone figured this out yet? Or can you suggest a plugin that doesn’t have this issue. It doesn’t seem like the authors want to address this.

I use W3TC plugin for page caching etc… and I resolved the cookie issue by adding an exception to NOT CACHE my new login page. Before this, I had to enter my login credentials twice as mentioned above.