Not available channels
If a channel is subscribed to be shown in TV-Browser but the data plugin cannot provide this channel, TV-Browser will show this channel with three red question marks as icon and (N/A) after the channel name (since TV-Browser 3.3.4).
This helps to prevent removing of channels because of Internet connection problems. If a data plugin temporarily cannot provide the channel you wont loose it in TV-Browser and still can view the data. If the data plugin can provide the channel to a later time all will be okay.
Data updates of course are not possible as long as the data plugin cannot provide the channel.