Hi Jason and videostream team, I've had the same buffering issues, upgraded to premium, and still buffering, followed any and all advice listed here and elswhere, I've rebooted and reloaded chromecast and chrome and router, no change....until my daughter came over for Christmas and her laptop had no issues at all. Obviously it was my laptop that was the problem.
I use maleware bytes, and CCleaner, I had already enabled videostream with maleware bytes, so i removed CCleaner, NOW IT WORKS!!!
anyone using CCleaner, get rid of it!! While it did a good job of cleaning, it was causing speed issues.
Happy new year!!