@wibbly This is most likely an issue with one of the social media accounts. I guess it is the Facebook account. Go to Preferences->Accounts and log out of your social media accounts, beginning with Facebook.
@“X Oriente” What exactly does the error message say in your case?
Today we learned that Facebook has a problem with their streaming server which causes an “Unknown Error” responds. This error message is displayed in mimoLive when opening a mimoLive document with a streaming setup for Facebook or when working with Facebook accounts. Facebook is aware of this problem and is working on it.
As a workaround you can use the RTMP based streaming setup and fill in the RTMP parameter provided by Facebook.