Depending on browser I now get different behaviors:
bpapps: After login on I get a link to my collection with a long ysid query string parameter. But no cookies are set at all. When I use that link, I am indeed logged in. As soon as I remove the ysid query parameter I loose my login again.
m.memonic.com: After login I get no cookies and the follow link doesn't contain the ysid parameter either.
On both bpapps and m.memonic.com I don't get get neither the ysid parameter nor any cookies.