[lubuntu] pcmanfm won't launch

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http://ubuntuforums.org – I am probably not the first person with this problem, I have hunted around for a solution but had no luck finding an answer. I am using lubuntu 12.10 fully updated. pcmanfm will not launch from the shortcut in the menu. Code: pcmanfm %U entered in a terminal also does nothing. Code: pcmanfm /home/username works. All help greatly appreciated. (Hardware)