Found the problem
It was one of the AMD Radeon Crimson settings...
Under the Video tab there are settings for...
Default, Sports, Cinema Classic, Vivid, Enhanced, Custom, Home Video & Outdoor.
All were OK with no blank bars around the TV EXCEPT... Home Video settings which I was using. Every time I turned it on the blank bars would show up & go away when selecting any of the other settings.
I also found under Custom that turning on AMD Steady Video would also cause the blank bars to appear.
Not sure who is going to fix this... JRiver or AMD