said by gigahurtz:I have actually noticed this too. This happens on my client box (not the main DVR) in my Whole Home DVR setup. At times it's been a black screen but goes away in 1-2 seconds. Another time it was a black screen with white text that read "Please wait..."
The trick is, what does the "Please wait..." look like? Does it have the font/color that might indicate it was generated by your TV or by the cable box? Some TV's HDMI signal lost message will say "Please Wait"