Hi,
All of sudden I faced exact the same issue and as of now no answer has been provided. It started to appear as early as in Mavericks. Prior to that it worked flawlessly. Their "Knowledge Base" is of no help either. Additionally it points to some font inside the app's package it failed to "download" or "initialize" whatever (can't recall the exact wording). Was you able to find a fix?

Greetings,
I.