Megazone, along with others on the TiVo Community, are reporting TiVo HD pixelation (aka macroblocking) on certain stations in conjunction with Scientific Atlanta CableCARDs. I’ve already returned my review unit, so I’m unable to confirm. However, MZ says TiVo is aware of the problem… but cautions:
If you don’t want to risk experiencing the issue and you can’t live with it until TiVo issues a patch, you may want to hold off on picking up a TiVo HD until the final fix has been issued.
And if you’ve already made a purchase, remember TiVo provides a 30 day money back guarantee. The clock is ticking, TiVo.