I will attempt to see this and help out in anyway I can. :p
Thought I could sum up everything that I said so it'll be neat c:
Try changing rendering systems. That could work.
Keep the tab open, even after you started the game up like you were doing.
Try a different web browser. You're using chrome, which is good sometimes, but you can also give Firefox a try as well and seeing if that works. Also, look into getting a tab refresher so you can stay on c:
You can also try logging into the tab using your cellular device and seeing if it works that way. It works for me and others so it might work for you.
And finally, make sure your internet is fast and running. Don't have so many things running in the background.
Hopefully I am not forgetting anything .... Best of luck friend ~!