thanks for your response. This model has buttons, but they are very integrated to the surface of the panel, almost as the panel has cracks in it and the metal between these gaps are the buttons. Anyway, the problem vary, so not getting the same osd menu pop-up, meaning if you're right, it's more than one button. Is there anyway to disable the osd? to lock it? and how do I update this firmware you mentioned (and from where do I get it?)
Thanks again.