At the moment, for YouTube to work correctly, you need to use a link to the channel. the chat is picked up only after the stream starts. You don't need to restart sheepChat for this purpose, if the YouTube chat doesn't pick Up after the stream starts, you can reconnect channels in the context menu of sheepChat.
Another problem with YouTube may be their protection from gray IP addresses, and we are currently working to fix this problem. A series of patches will be released soon to solve problems with connecting to YouTube.