When trying to stream to my connected Youtube account, the "Stream Live" comes on for all of one second before automatically going offline again. However, if I enter in my Youtube account's information for Custom streaming (URL and key), it works, but doesn't incorporate the Chat overlay with it.
The only complication I could think of was that I technically have two accounts connected on Youtube (one that I use for streaming, the other attached to my email - it only happened because the one predated Google's acquisition of Youtube), but even trying the other account results in the same issue.