MHEG (in UK) can cause some TV channels to display black screen after using. Its random and frequent bug [clean Vista SP1 integrated install and security updates and two hotfixes with TV Pack)
Found the MHEG can crash a lot.
Serious bug with setting Media Center to autorun via the HKLM registry RUN key for EHSHELL.EXE - has worked since 2004 edition, but in TV pack on INTEL G965 chipset, a message about graphics not being good enough is displayed. Have to then exit VMC and start it back up again. Also the same bug if you set in Group Policy, EHSHELL.EXE to be the Windows Shell. Previously this functionality always worked which meant if people exited Media Center they didnt get explorer or any start menu - VERY handy to lock down the MCE login account !!
Prefer autorun with one of methods above so that when teh machine boots and auto logins, there is no start bar displayed or media center logo, I just get the Welcome screen and then VMC SHOULD fade up to the main menu, TV Pack has broken this, at least on the Intel Integrated graphics (which support HD) for the latest version of the Intel graphics driver and previous.