See my post above from six days ago. I have a low-pass filter at the ONT, which has had no effect on the picture quality through my four Verizon set-top boxes, which I have in addition to my TiVo HD. I have added 16 db of attenuation (two 8 db attenuators) to the cable attached to the TiVo HD box. I had been told by TiVo to continue to add attenuation until the pixellation stops. (Fourteen db nearly fixed it; 16 db absolutely stopped the problem.) Now, finally, after adding the low-pass filter and the attenuation (as TiVo had recommended), I have finally eliminated the pixellation entirely. These changes have not affected the picture quality through the TiVo HD nor through the four STBs. Spread the word!