How to stop appearance of ^T% in the first line when I open a new lxterminal tab with ^T in zsh?

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http://unix.stackexchange.com – Steps to reproduce: have zsh as default shell open a new terminal. for example, with Ctrl+Alt+t press Ctrl+Shift+t to open a new terminal tab "^T%" appears as the first line I'm running ubuntu 11.10 with lxde and zsh-4.3.11 gnome-terminal doesn't have this problem (HowTos)