This morning I tested my 50PHD7UY with DVE to see if my set had the same symptoms described in this thread. It does. I then contacted the Panasonic Plasma Engineers dept. I described the problem and e-mailed the website where the problems were well documented with photos. About a half an hour later, the "technician" called back and told me that the problem seemed to be hardware related. He said that he had not seen this before. And that it needed to be looked at by a service technician for repair. In that case he said I should take the panel to the nearest service place. I have no intention of carrying this thing anywhere. Since I have the extended "in-home" service contract, I'll make use of that if need be.
However, there is a bigger issue here. Panasonic must know by now that there is a problem with some, or all, 7UY's. I gather that they have already been informed. So, if there is a solution, then we should be told that there is one and how to proceed to get the fix made. If they don't know how to fix it, what good is a local service guy coming to my home going to do? And if he takes the thing with him, how many weeks will pass by until a solution is found? I would have expected him to say that a fix is being worked on. And that I would be notified when to schedule the service call. But apparently, that's not the case. So, I'm leary about the whole thing. Is Panasonic just "playing-dumb-and-passing-the-buck"? Or, is their problem reporting system really that bad? Hard to tell at the moment.
Anyway, I'll go thru the motions to get the service done via my Philips "in-home" service contract. Hopefully, he can get the problem resolved. Even if it means replacing the TV. I'll report back when I know more.