I've got an alpha-stage language quizzing app at paideia.fluxflex.com that requires auth login for pretty well every controller to track students' performance. But today when I pushed new changes to the server the login no longer lasts past any page refresh. Even an ajax refresh of a component returns a "login" link instead of the expected contents. This affects the admin interface too, where I'm prompted for my admin login on every action (i.e., page refresh). But this only happens on the public server. When I run the app locally (on the rocket server) I have no problems. I've had a lot of minor trouble with fluxflex, so I'm not sure if this is a server-level problem or whether I've somehow introduced a bug. Any idea what would cause this kind of behaviour?
(I'm a bit panicked here because my students are supposed to be using the app! That's what I get for trying to use a devel site in a class.) Thanks.