# Fix DMN editor problems

Three questions cover most DMN editor reports, and the first is a design decision rather than a fault: a new DMN model opens as an empty default table, because that is what most people want next.

The rest are the usual browser-level checks.

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## What this is for

* A model that opens as an empty default table.
* A thumbnail that will not generate.
* An import that arrives incomplete.

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## How it works

| **Action**               | **How**                                                                   |
| ------------------------ | ------------------------------------------------------------------------- |
| Empty default table      | Expected for a new model. Open the requirements diagram to add structure. |
| No thumbnail             | Previews are written in the background. Wait a few minutes, then reload.  |
| Incomplete import        | Check the file is DMN and keeps the .dmn extension.                       |
| Cramped properties panel | Drag its edge to widen it.                                                |
| Editor will not load     | Hard reload, then a private window.                                       |

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## A few things that catch people out

* A new model with one empty table is correct, not broken.
* Thumbnails lag saving by a few minutes, like every other preview.
* Broader symptoms are in [Troubleshooting](https://help.gocapable.com/diagrams/troubleshooting.html).

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## Related

[DMN viewsThree views of the same model.](https://help.gocapable.com/diagrams/dmn-views.html)

[Build a decision requirements diagramThe map, before the tables.](https://help.gocapable.com/diagrams/build-a-decision-requirements-diagram.html)

[DMN editorBack to the editor overview.](https://help.gocapable.com/diagrams/dmn-editor.html)

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_Draw the map before writing the rules._