I've been using Xcode for 3 years and whenever I have had a problem, such as an exception or unrecognized selector, its been very easy to see the culprit as Xcode displays the reason in the output.
However its no longer doing this, it seems to have stopped a few days ago, but I've not knowingly changed anything. Nor have I changed from running debug to release build for example, its the exact same project and I've not changed any settings of the project nor of Xcode.
How can I set it back to display useful information in the output window when there's an error?
(Xcode 5.0, output is set to "All Output")