How can I determine why sublime-text 2 will no longer start for me?

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http://askubuntu.com – My sublime-text 2 editor no longer starts when I click it's icon in my dock. The icon does the normal slow pulsing for a while (unity) but nothing seems to load. How can I determine why sublime has started failing? UPDATE Output of $ cat /usr/share/applications/sublime-text-2.desktop #!/usr/bin/env xdg-open [Desktop Entry] Name=Sublime Text 2 GenericName=Text Editor Comment=Sophisticated text editor for code, html and prose Exec=/usr/bin/sublime-text-2 %F Terminal=false Type=Application MimeType=text/plain;text/x-chdr;text/x-csrc;text/x-c++hdr;text/x-c++src;text/x-java;text/x-dsrc;te (HowTos)