Anybody else having problems with Mountain Lion restrictions on unknown applications?

After upgrading to the new Mountain Lion OS X 10.8 i can't open an application I already had downloaded that worked on the previous OS X Lion.
It came up with a message saying it wouldn't open because of an unknown developer, and I read you can get around it by right click or option click and open.
When I tried this it didn't come up with a message saying it wouldn't open, but the application still didn't open. Anyone come across this problem and figure out how to fix it?

If you open System Preferences>Security & Privacy.  Under the General tab choose to Allow Applications downloaded from anywhere.
Now you should be able to launch the application.
A couple caveats:
I assume the app in question is one you used before and is from a know developer that you trust.
It's probably a good idea to restore the Allow Downloads setting back to one of the two more restrictive setttings.
Matt

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