xfce4-terminal won't start (I/O error)

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http://askubuntu.com – I tried to start the Xfce Terminal through the menu, however every I get an error box with this message: Failed to execute default Terminal Emulator. Input/output error. This is strange as I've never had this error before, and haven't done anything on my system that would affect the terminal. I have verified that the Xfce Terminal is my default terminal emulator in the Preferred Applications, and I have also tried purging and installing the xfce4-terminal package. When running xfce4-terminal through xterm, I get this: $ xfce4-terminal [1] 12197 segmentation fault (core dumped) xfce4- (HowTos)