You can see the logs in Device logs. Open xcode Window-->Devices (Select device)-->Device logs.Click on 'up' arrow button to see the consol.It display every logs in development/adhoc/appstore apps.
The console in Xcode will only display output from your application's process, not the firehose of output shown in the general device console.
I too face this problem recently and found it working when I force quit xcode and try clean build. Its adhock but it works. Have fun.