Due to a recent update by JWPlayer, it has caused unusual behaviors in some devices. Please follow the steps below to Cast the signal:
Enter the content and activate Chromecast. If you cannot Cast the content, please continue with the next step.
Exit the content with Chromecast activated.
Then enter the same content or any other content, and you should be able to Cast it without any problems.
Until JWPlayer provides a new update for this correction, this procedure should be followed on those devices with such behavior.