During playback of a previously recorded program, opening the guide will stop recording playback and display a black screen with a spinning wheel. Video and audio will both be unavailable. The black screen and spinning wheel will continue until you press the back button twice, and then press the home button.
This is a known operational inconvenience that may or may not be changed by a future Live Channels application update. To avoid this issue you must press the back button while you are watching the recording to exit, and then you can open the guide or any other function.