# Dashboard gadget on a shared or anonymous dashboard shows nothing where a Mermaid, PlantUML or Graph

**What you are seeing**

A dashboard gadget on a shared or anonymous dashboard shows nothing where a Mermaid, PlantUML or Graphviz diagram should be. And no error message.

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## Why it happens

The dashboard gadget is the only surface that is not restricted to logged-in users, but server-rendered diagram types need an authentication token, and anonymous viewers are never issued one by design.

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## What to do

Require sign-in for that dashboard, or rebuild the gadget using a type that draws in the browser. Draw.io, Excalidraw, BPMN or DMN. Which still render for anonymous viewers.

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## Settings involved

| **Setting**                              | **Where** | **What it does** |
| ---------------------------------------- | --------- | ---------------- |
| Diagram (gadget configuration). Diagram  | \-        | \-               |
| Diagram (gadget configuration). Language | \-        | \-               |
| Diagram (gadget configuration). Title.   | \-        | \-               |

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## Limits that apply here

| **Limit**                                | **Value** | **What happens**                                                                                                                                                                         |
| ---------------------------------------- | --------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Browse page size                         | \-        | Each JQL page requests 12 issues and the list reveals 12 rows at a time; Show more loads the next batch. (The shared hook's own default is 50; the Diagrams page overrides it to 12.).   |
| Render request size switch (GET vs POST) | \-        | Diagram source shorter than 4,300 encoded characters is rendered via a GET URL; anything larger is POSTed as JSON. Source too large to encode at all logs a warning and does not render. |

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## Related

[Gadget's title or description cannot be set, or a description I expect is never shownBoth fields exist in the gadget's stored configuration, but the gadget's edit screen rende](https://help.gocapable.com/jira-diagrams/gadget-s-title-or-description-cannot-be-set-or-a-description-i-expect-is-never-shown.html)

["Manage Apps" or "View on Marketplace" link on the licence banner leads nowhere usefulThe banner builds a Confluence admin path (<siteUrl>/wiki/plugins/servlet/upm), which does](https://help.gocapable.com/jira-diagrams/manage-apps-or-view-on-marketplace-link-on-the-licence-banner-leads-nowhere-useful.html)

[Permissions and accessThe rest of this family.](https://help.gocapable.com/jira-diagrams/permissions-and-access.html)

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