This issue is not related to Flash updates, AdBlock or browser caching,
Join in your chat using the url: https://chatsgroup.com/web_gear/chat/media.php?d=Asistencia&p=0&id=51148438&t=0
Allow the Flash player to execute in the page above.
This URL is the iframe below of your chat, since you allow the flash player to execute in "xat.com" it will run in all subdomains *.xat.com,
But as you can see, the iframe is using another URL, so you can try to unblock it.
If the problem is in your player file please post it, and we'll verify it for you.
Let me know if it doesn't work.