Hi there, trying to follow this thread.
are you saying one user is not able to see a particular screen share, but others can?
I don't believe we've seen this before reported anywhere.. Can you try to see what the bitrate is for the receiving user if/when this happens again next time?
you can use
remoteParticipant.getTrack('screen_share').currentBitrate
docs
Are you using track permissions at all?