JVC DR-MH30 dvd recorder - PAL/NTSC?

I have purchased a JVC DR-MH30 dvd recorder in the US and brought it to Europe. It worked ok in the US, but here when I try to see the input to the DVD from the cable box I get a B&W flickering image in the TV screen. I don’t have this problem when I watch dvds. I believe it specifically said that it is compatible with both PAL and NTSC. Does anyone have any clue ?