Ettercap -G MITM not showing anything

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http://www.backtrack-linux.org – Hi everyone, I'm having troubles using ettercap to do an MITM in my own network. I deployed a switch, connecting my victim pc, my atatcker pc, and the router(default gateway) When I start ettercap using comand: Code: ettercap -G sometimes, when I scaning the hosts I get this error: Code: (<unknown>:6026): Gtk-WARNING **: Invalid text buffer iterator: either the iterator is uninitialized, or the characters/pixbufs/widgets in the buffer have been modified since the iterator was created. You must use marks, character numbers, or line numbers to preserve a position across buffer (HowTos)