That white login button happens to me with Firefox. Use a different browser and make sure it and the java plugin are up to date. Chrome browser seems to be working best because it has minimal features. Disable add-ons and disable pop-up, ad, and script blocking. Delete your cookies, temporary internet files, and history first and restart your browser before you login again. It sounds like you have a corrupted application so you should use the new 'remove' button to delete that one and start over.
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