1. Ensure that you're on the /latest version of the Chrome Browser.

2. Open a new tab in Chrome.

3. Type or copy/paste chrome://flags/#load-media-router-component-extension into the address bar.

4. Check and see if the status is "Enabled". If it is, try "Disabling" and relaunch the Chrome Browser.

5. Repeat steps 1-4 but this time Enable the media router again.  

6. After relaunching the Chrome Browser, test casting.