hello @TeamYouTube why am I seeing gray videos 



pic.twitter.com/9cfvYPCDeh
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Thanks for clarifying. Have you tried clearing your browser's cache and cookies? Here's how: https://goo.gl/dwzcyo . Also, does this happen across browsers & on Incognito mode? Keep us posted.
yes i have done it but now my streaming completely fine. I want to ask you a question why some videos shows 360p 480p 144p 720p 1080p 2144p 1440p please clarify.
Glad to hear the issue is fixed. Also, mind sharing screenshots and more info about your question? We'll look into it.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.