its not possible to change the tv channel. not with gui, keyboard or remote.
the last know working cvs-snapshot is 17-01-2006.

last time tested with: cvs-01-31-2006--01-03

"Grab EPG from DVB" is dissabled. all channels deselected in Setup->TV->EPG

Test-Procedure 1:
1.enter MyTV - > a channel is display (in my case SAT1)
2.try to swtich to Pro7
3.TV is black, no Audio
4.try to switch back to Sat1
5.TV is black, no Audio
6.try to dissable TV
7.not possible to deactivate TV
8.exit MediaPortal.
9.takes some time until MediaPortal is closed. BUT the process is still runnning (taskmanager)

Test-Procedure 2:
1.enter MyTV - > a channel is display (in my case SAT1)
2.exit MediaPortal.
3.MediaPortal is closed. MediaPortal process is also closed (taskmanager)

the process is ending if i do not try to change the tv-channel.