Since the latest update riders have been disappearing off their bikes, then reappearing. When riders disappear the bikes have still been moving. I use an IPad to Zwift and this has been occurring in training rides and others reported the same issue.
When I start Zwift from my IPad it now immediately closes then makes me open it again and then seems to work.
I have been having issues with rides saving correctly, where Zwift closes before it saves.