On my desktop (Chrome, Windows) I appear logged out and I can't log in--when I click on log in and enter user& pass it says I've connected successfully, but nothing happens (I still appear logged out, can't comment, can't post, etc.). However, when I go to a page I've already been to (like my user page), then I "become" logged in (without having to log in), and when I go back to the home page I'm suddenly logged in.

On my phone (Chrome, Android) I don't have this problem. What to do? Clearing cache doesn't work, I've done it many times now.