This only happens if I start viewing a channel using recent channels. This does not happen if I start viewing a channel from the guide.
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Start viewing a channel from recent channels under Live TV & DVR.
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Press up to show the guide.
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Browse the guide and either start viewing a new channel or press back to go back to viewing the current channel
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Press up to show the guide again
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At this point you can not interact with the guide other than pressing back to go back to viewing the current channel.
UPDATE:. It appears that if I leave the guide open after pressing up the second time it starts working after about 40 seconds.