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Fixed in 2020.1.X



Found in





Issue ID




Clicking on the Layouts button causes "Menu Window/Layouts couldn't be found" error with specific scripts in the project

Window management


Reproduction steps:
1. Open "LayoutButtonBug" project
2. Click on the "Layout" button

Expected Result: Layout drop-down appears
Actual Result: "Menu Window/Layouts couldn't be found"

Reproduced with: 2020.1.0a9, 2019.3.0b8, 2019.2.10f1, 2019.2.0b1, 2019.2.0a7
Did not reproduce on: 2019.2.0a6, 2019.2.0a1, 2019.1.14f1, 2018.4.12f1, 2017.4.33f1

  1. Resolution Note (fix version 2020.1):

    The reason for the issue is because the code was incorrectly assigning a lambda function to "EditorApplication.delayCall", which was messing all our internal uses and preventing the Layouts menu to be properly populated.

    What the fix does is change the type of "EditorApplication.delayCall" from "delegate" to the more appropriate type "event". This prevents users from incorrectly assigning directly to it. So the user will have to change his code from:

    EditorApplication.delayCall = () => {};


    EditorApplication.delayCall += () => {};

Comments (2)

  1. unity_4tsblackcat

    Sep 16, 2022 19:43

    Regression on 2022.1.15f1 after having to reinstall the editor, and resolving TxtMesh Pro packages. Search for 'EditorApplication.delayCall' assignments turned up nothing in the Assets folder.

  2. Renea

    Apr 28, 2020 20:01

    What script does that change need to be made in. I did a search on my whole solution and didn't find that line.

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