Can not load the AuV3 Filter Demo fx in Logic Pro X (orange exclamation icon)

Here you have the description of a bug (36211498) I've entered in Bug Reporter on 25 dec 2017

Could you please follow the procedure I've described in the next lines and post your feedbacks.


Description:

I experience an orange exclamation icon in some circumstance in Logic Pro for the FilterDemo AuV3 fx. It’s not easy to reproduce but I’ve found I way that should help you to identify the issue. There is also here another company having similar issues regarding AuV3 launching issue https://discussions.apple.com/thread/8151498 To facilitate your investigation I've reproduced the bug with your official FilterDemo AuV3 sample.


Steps to Reproduce:

1) Download the last version of the AuV3 sample at https://developer.apple.com/library/content/samplecode/AudioUnitV3Example/Introduction/Intro.html

2) Build the project FilterDemo in Xcode

3) Start Logic Pro and create a new project from a template and select HipHop (big project is important)

4) Show the mixer view

5) Add the FilterDemo AuV3 fx on the fourth track “Agile Synth Bass”

6) Save the project on the desktop to “TestFailingAuV3.logicx”

7) Quit Logic Pro X

8) Go to the desktop and double click on the file “TestFailingAuV3.logicx”

9) In the mixer view go to the fourth track “Agile Synth Bass” -> you should get a orange exclamation icon and a not working fx. Expected behavior: no exclamation icon and a working fx

10) Quit Logic Pro X

11) Lauch Logic Pro X from the dock

12) Select open the most recent project “TestFailingAuV3.logicx”

13) In the mixer view go to the fourth track “Agile Synth Bass” -> you should get no exclamation icon and a working fx


So it's weird that the launching of the AuV3 works when you open the project using the recent project and does not work if you double click on the file.