Nope. I left it unplugged for like 5 minutes. The programs that recorded last night ONLY have the channel logo and not the program logo. These particular programs (on different channels) always had the program logo. Always something with DISH.
I wouldn't worry about it. There have been times where my HWS had several missing logos (I never lost all of them, but I have had about half of the logos disappear randomly). I predict that they will return within a day. If they do not return after a whole day, then you might have a problem.