more likely, a flaky comcast. in my case it took comcast 3 attempts (over 3 days) to get it right, and none of it had to do with the Tivo. 1.) they didn't verify the cable had a signal 2.) they didn't verify digital channels worked before they left (HD works, so you must be good! yeah right.) 3.) they changed out the red motorola cards for blue cards after which "hits" started working... the red cards I had (for whatever reason) weren't accepting any of the "hit" broadcasts. it's entirely possible comcast had the wrong numbers, but i wasn't able to find out if this was true. The tivo was never the problem (unless there's something about it's software that made my red cards not listen for "hits"... doubt it)... Just one case where lots of trouble has nothing to do with the Tivo, doesn't mean it couldn't be the tivo's fault for other people... As a good end to my story, we did get refunded our $25 install fee after my wife called to complain.