question asked a the forum: https://flowplayer.com/forum/#!/scripting_api:chromeplayer-session-across
might be useful to try not to rebuild the whole player dom element and only use the load method
loading the clips helped, the UI stays, but only for the duration of the player modal.
Once that is closed, the problem is back.
Another issue is that the following clip still doesn't play automatically on Chromecast after load() is called.
Both of these issues will hopefully be fixed in Flowplayer 7.3