Guake and gnome-terminal $PATH

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http://askubuntu.com – Most of the time I use Guake as terminal emulator. Today I wanted to start a program from gnome-terminal and it tells me that it's not installed currently, although I ran the program a minute ago on Guake... When I echo $TERM, I get xterm on both, however echo $PATH in gnome-terminal differs. Does anyone know what this is about ? (HowTos)