About a week ago, our TiVo Series3 was delivered, and yesterday the Comcast installer came to install the two CableCards, and a DVR. The installation time was supposed to be between 12 and 4. At 3, the installed called and wanted directions. I asked him if he had the CableCards, and he said that he didn't have any in the truck. He said that he could install the DVR and schedule another appointment for the CableCards, or he could come back after 5. I said that he should come after 5.
When he eventually came, he did bring both CableCards and the DVR. The installation was pretty quick. When he left, the DVR had video, but had no program guide. He said that it would begin to appear in 30 - 45 minutes. The Series3 was left "Acquiring Channel Information". The Series3 was supposed to acquire this info in 30 minutes as well.
After several hours, the devices still weren't working. So I called Comcast customer support. After some failed attempts to fix this over the phone, an service visit has been scheduled on Tuesday. Hopefully, this will be resolved on Tuesday.