Xcode doesn't write anything to output console

Question

I am working on an iPhone/iPad app. All of a sudden output console stopped displaying ANY messages AT ALL. I tried to open older project - works just fine. So I thought that

Answer 1

Using filter?

A similar thing happened to me. In my case, I had by misstake entered a filter in the status bar of the debug area. Only rows that match the filter are displayed, and since my filter was rubbish nothing was displayed.