MacOS app does not run on the Xcode simulator

Question

I\'ve installed Xcode 4.2.1 on Mac OS X Lion.

When I create a new (Mac OS X Cocoa) project and I click \"Run\", Xcode says build succeeded, but does

Answer 1

I know this is a well accepted answered question, however for those who are building / running on a physical device

SOLUTION: Hard-restart the device, then clean the project in Xcode ⇧+⌘+K.

I think the bundle gets confused causing Xcode to "think" it already ran the project, therefore showing "Finished" instead of launching whichever application you selected to run.