Hello , I tried to reproduce the bug as your directed on my andriod 4.4.2 device but seems to work as expected, also your contribution is not informative and descriptive the process to reproduce the bug is unclear, if that tends to be a bug i believe it is a cosmetic issue because you eventually log into the app, probably by reloading the page.
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RE: Bug found in MaterialFBook ( do not showing the password box in application )