Not sure which module is responsible but there is a conflict between lightbox2 and securepages.
Problem occurs when lightbox2 "Enable login support" is enabled and securepages is set to secure "/user/login".
When clicking on a Login link the lightbox window appears and is empty. Closing the window and clicking the Login link again correctly loads lightbox with the login form. This affects all browsers.
Does Jquery load() understand 302 redirect with Location Response? I thought a 302 is handled transparently by the browser.
Anyone have ideas on how to fix?