DvbDream Community

I have DD 1.4G, and latest E*m*u, which reported working fine for other people. However channels sometime show no video/audio eventhough the channel icon (V) is GREEN. I switch channel, and/or re-scan the sat, it does not help.
What could be. I observe this isssue since version 1.4e
Not sure something with DD or mysetup. Any idea? Thanks

Below attachement is the error information I got when switching channels

What freq sat etc?

SOme feeds have signal but no picture the first 5 minuts before the are in the air.