We recommend that you go to your browser's settings and clear both your cache and Hosted App Data from the beginning of time. This should allow you to play the game without any issues.

Please use this guide as reference on how to do the above: https://imgur.com/a/K49vG.

Please also consider trying to load the game in a different browser such as Firefox or Edge, as well as running the game with as few other tabs open as possible.