Hi mate My login seems to be looping I can log in but every button I click takes me back to the login page again to login, even thew email button. I have the latest Firefox and I am using the web version of Myibay. Even when I snipe it logs me in and when I add it then tries to log me in to the main page of Myibay.
I have used it for a couple of years now and love it but it has never had this before.
My guess is to check if your cookies are enabled, and you don't have any kind of software which could strip the cookies out.
Also, clearing your browser's cache is a good idea too.