Not a major problem, but whenever I use the menu system on my VCR it flickers when displayed using the PLV-30. I have tried two VCRs (Toshiba V857B and Panasonic NV-HS860) and they both do the same. What could be causing this? The VCR is connected via S-Video through a Denon 3801. Menus are fine when displayed on a TV.