I use Mytheatre with my Twinhan 1020a, Nexus-s and Fusion Gold USB ATSC tuner. Windows XP has some problems with the USB drivers and sleep mode. Mytheatre works great for recording from any of these, but no program guide. With the Fusion USB, every so often when my computer comes out of sleep mode, the USB will drop back to low speed and the tuner will not operate. A reboot of the computer solves this untill next time. It is not everytime that the computer comes out of sleep mode that this happens, but usually after five or six resumes. I have a DVBWorld DVB-S2 internal card, but have not installed it yet as I am waiting for RTN to change over to DVB-S2 and for Mytheatre to support DVB-S2 streams.
My computer is left unattended during the week and it comes out of sleep mode for the timers set in Mytheatre. Once the timer has finished recording, Mytheatre shuts down and then after three minutes of no activity, the computer power management kicks in and puts the computer into sleep mode, waiting for the next timer to take place. When I am at the computer I play with the Fusion ATSC USB box, but my signals are very weak and intermittent. I still have work to do on my antenna.... an ongoing project.