I am not able to reproduce your problem. Can you provide a set of steps to reproduce the problem?
Does it happen all the time?
Do other symbols display?
It looks like you're editing a map notes layer, true?
It looks like you have a subscription or a trial subscription.
What role does your username have? User, Publisher, Admin?
How is your organization configured? It looks like it may be SSL enabled. True?
Thanks,
Mike