It's been a total lottery at home. Usually HGTV and TravelHD and TLCHD come and go as they wish (just get the gray screen on the Tivo or the infamous "channel not available" or something). It's gotta be something with the cable cards at this point, IMO (meaning TW changed something at the head end that interferes with the CC ablility to tune/detect the SDV channel properly). We're still a major firmware revision behind on the TA and CC (at least from what I can tell on the Tivo community forums).
The SDV channels I wanted to watch tonight (Discovery, History) are completely unwatchable tonight. Pixelated to the extreme, telling me the channel is unavailable, try again. I'm forced to watch the SD version. Great technology, Time Warner!