This issue is not easy to describe precisely except by the steps to reproduce it.

h4. Steps to Reproduce
1. Open TV.
2. Start any channel (tuning should succeed), go to full screen mode.
3. Try to change to a channel that you know will fail. You should be left with a black screen (!!!) after tuning fails.
4. Open mini-guide (press enter) and try to start the channel from step 2 again.
=> the mini-guide goes away but TV Server isn't actually trying to tune the channel. You must pick a different channel then come back to the one you want to watch.