Problem: In control meeting, some users show as "orphaned" and cannot be removed.
Cause: The known scenario of what you are seeing has been observed when an iOS user's closed the application or it has crashed mid-conference.
iOS as an operating system does not send back a graceful close to our Portal and as a result Vidyo ends up displaying this place holder for about 15-20 minutes until that is cleaned up on our end.
Solution: Currently there is no further mitigation Vidyo can offer for this iOS behavior. This does not happen with Android or other endpoints to our knowledge.