Currently Being ModeratedJan 20, 2013 6:14 PM (in response to felix47)
I found a fix, it's Mountain Lion's fault; "Show in Finder" and "Reveal in Finder" also don't work in other applications like Spotlight and Photoshop.
Basically run this in Terminal:
sudo killall -KILL appleeventsd
Currently Being ModeratedJan 21, 2013 10:26 AM (in response to bayxsonic)
it can't be an universal bug because it doesn't affect every one running Mt. Lion. I have no problems with Reveal in Finder in iPhoto as to many others here. So it's got to be associated with individual installations and configurations. At least there's a temp workaround till you find a fix.