I tried to join the Pro4mance group ride today (7/19/16, 6 am EST). I clicked join at the first screen. There were I think 4 rides queued up including the Trek-Segafredo coffee ride and maybe 2 more in addition to the Pro4mance ride. Once the Trek ride went I saw a ‘Join Now or automatically in x seconds’. I clicked it as well to ‘join now’. I then continued riding for the next 45 minutes and never was transported to the group ride.
It seems other folks are having this experience as well, based on comments I’ve seen.