Can't cast screen to Chromecast

I'm having problems casting my screen to either of the two Chromecasts in my house. Whenever I try I immediately get a "casting has ended" message, following by "Disconnecting". I have no problems casting from my Nexus 10, so it looks like a problem with the app on the S4. I'm running Goldeneye (Lolliopop 5.1.1), and Chromecast app v1.11.11

I've tried rebooting, and uninstalling and reinstalling the Chromecast app,but it hasn't helped.

Has anyone else had this problem?