Who ordered the Zebra ?

Hi folks , anyone else get a zebra for Xmas ? Watching Xmas DVD's on new Panasonic TH-42PV500 plasma TV , via Krell- The Standard , & noticed faint vertical stripes , grey/black when viewing dark scenes . With R1 DVD,s twice the number of stripes appear ! Xmas special, 2 for 1 offer on zebras I guess . This happens when using the RGB or component outputs but if I go via a scart the faint stripes disappear but so does the picture quality . The problem was also noticeable with my old 32 wide screen Sony so number one suspect is the Krell . Anyone come across this problem at all ? Cheers y'all & Happy New Year .