If what was suggested above doesn't work, you may want to consider logging into the play game tab on a mobile device or tablet. Also, it seems to load better if you log into the game tab and let it sit for a couple of minutes before opening the game.
If you are having issues with your characters loading, try resetting their homes by logging in through the user panel and clicking both "Reset Home" and "Go Home" for each character.
If to no avail, you can try changing your rendering subsystem through the in game options on the login screen. This might make it easier for your computer to load the graphics and game.
Hope this helps, and good luck! c: