Is the block completely disappearing or is it there but not displaying data? If the latter, it could simply be that no one meets the Achievement settings setup for displaying on that block. If the former, I would advise disabling any third party applications/plugins then attempting again.
If you continue to have issues, it looks like you're utilizing some type of SSO for the front-end of your community which we do not have access of in the Client Area access details. We would require you to add those access details so we can further assist. Could you please update these details by visiting your client area, selecting the relevant purchase, then clicking "Review/Update Access Information" under the "Stored Access Information" section.