Quite a few people are asking if DIRECTV Double Play has auto-pause enabled when you switch channels. This would be a pretty awesome if they did, but unfortunately no, there is no auto-pause. If you are interested in pausing the program you are watching, then you should pause whatever show you are watching and then switch over to the next channel.
DIRECTV had to implement the feature which would make sense for most users. Typically, you will find that the majority of people enjoy having the programming running while they switch over to the next channel. If there is something they want to get back to, they can always rewind and check out what they missed.