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WordPress 3.8 gives me “You must enable cookies to use WordPress.” at login

Solution: 

Try to add below code in your theme’s function.php

            //fix for cookie error while login.
            setcookie(TEST_COOKIE, 'WP Cookie check', 0, COOKIEPATH, COOKIE_DOMAIN);
            if ( SITECOOKIEPATH != COOKIEPATH )
                setcookie(TEST_COOKIE, 'WP Cookie check', 0, SITECOOKIEPATH, COOKIE_DOMAIN);

One more option which worked for me, I developed my client’s on my server and it’s URL is “www.mydomain/clients/clientname” when i deployed it to client’s server on main domain i was getting this cookie issue in WordPress backend, tried almost every solution available online but this one worked for me. Go to wordpress database and check “wp_options” option table and change url to you domain URL Woila! worked for me.

See if this can help someone.