'Reveal in Finder' doesn't work

Maybe you are using TotalFinder? This Problem is OS X 10.8.2 related. Try:

sudo killall -KILL appleeventsd

Whatever appleeventsd does, this fixed it for me.

Discovered by Antonin Hildebrand himself.

https://getsatisfaction.com/binaryage/topics/totalfinder_and_archive_utility_not_playing_nice

and

http://blog.freron.com/2012/recipe-for-trouble-os-x-10-8-2-mailmate-and-spamsieve/