I got another sort of error lately in the game for the browser version 2016. While browsing in the training section (selection of players followed by selection of drills), the training screen went partly dark (darker at the bottom right corner to whiter going to the top left corner, like a sort of gradient effect). The game was still usable to some extent, but no in-game window pop-ups worked, that is, for example if I clicked on a player, the profile does not pop-up, and also the training could not be completed. After some time, the page went non-responsive, and I had to reload the game.