I'm getting a Google Drive permission error on several (but not all) charts... not sure if that's a problem on your end or theirs, but you might want to look into it.
Chromium seems to display all charts without any problems (same computer).
Btw. it looks like once a chart has been loaded successfully, it is cached so that you have to clear/disable the browser cache in order to see the issue again.
Thanks for letting me know and the nice words!