multimedia
castnow hangs on 'loading'
Occurs when running the laptop for a longer time, if you reboot it works again. So some process is interfering, i thing Docker is one of the candidates.
At least if you stop docker it works again. Next time see if restart is enough.
It has to do with the network interfaces that docker starts up, it seems castnow starts up a web-server that chromecast should reach to play. But when docker runs castnow reports one of the docker ip addresses and not just localhost.