Trouble logging in on Safari

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Anyone else have trouble signing into a concrete5 website with Safari version 11. on the desktop? (Not concrete5.org, but a site built with concrete5...) I am guess there must be something in my Safari setup that is messing things up (though it's a vanilla install of Safari). Chrome and Firefox login in fine, but Safari just returns me to the login page. Happens with my newer sites (5.7, 5.8). I don't know if I need to use Safari to edit, but a client might want to. it's weird.

Just wondering if anyone else had the same issue and knew a fix.

Thanks all.