I couldn't start yelp as well.  
In "/etc/gre.d" there were two files: 1.9.2.17.system.conf  2.0.system.conf

The second one was the culprit. Turns out some another application
(chmsee) had requested xulrunner 2.0 as a dependency and this resulted
in the creation of said file, which happens to block yelp from starting.

This solves the problem and it has no adverse effect on chmsee.
cd /etc/gre.d
sudo mv 2.0.system.conf 2.0.system.conf~

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https://bugs.launchpad.net/bugs/568876

Title:
  Gecko-dependent apps won't start ("Could not find compatible GRE")

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