Logic frozen when loading projects with multiple JUCE'd AUv3 instances

Audio Plugins
1

Hi,

I found an issue that AUv3 plugin made with JUCE causes Logic Pro X frozen when save and load a project contains multiple plugin instances.

Condition:
An AUv3 plugin made with JUCE is installed. A simple plugin that is just built based on the template can reproduce the issue.
Mac OS X Catalina 10.15.7, Logic Pro X 10.6.1

Repro Steps:

  1. Launch Logic Pro X and create multiple software instrument tracks, load AUv3 synth instance for each. In my case, I created 7 tracks.
  2. Create MIDI region that contains some notes for each track.
  3. Save a project and close the project.
  4. Load the saved project.

Expected:

  • Load project successfully.

Actual:

  • Logic Pro X freezes, cursor goes to infinite rainbow. Plugin seems not loaded completely (the plugin name is grayed out). 100% repro.

This does not happen for non-v3 AU. Checked JUCE 6.0.0, 6.0.5, and latest develop build and all repro.

Not sure if this is caused by JUCE or Logic. Does anyone sees the same issue?

2

Thanks for raising this. The issue should be resolved by this commit:

1 Like
3

Thank you for fixing this quickly! I’ve verified the fix with my plugin.

4

hi @ring2 and @reuk - i’m seeing this same issue but i have the above change (i’m using 6.0.8 from master). was there anything introduced recently that would have caused it to happen again?

for me i just need more than one instance in logic to trigger this. i’m on osx 11.2.3 and the most recent version of logic

ok totally confused but i removed all instances of the plugin from my system, then reinstalled, and now it’s working. sorry for the noise, i don’t know what was going on.

nope it’s back again.

i also tried to repro this with a debug build and couldn’t cause it to happen.

5

I don’t think we’ve made any changes in this area recently. Are you on an Intel or M1 mac?

6

I’ve tried to reproduce the issue in Logic 10.6.1 on both Catalina 10.15.7 and on the Big Sur 11.3 beta. I tested with JUCE develop, but there haven’t been any changes to the AUv3 wrapper since the last push to master.

To test, I created 16 tracks, each with an instance of the AudioPluginDemo AUv3 (built in Release mode), and added a midi region to each track. I then closed and re-opened the project several times. In all cases, Logic remained responsive.

Please can you provide instructions to reproduce the issue, and ideally some example code which demonstrates the problem.

1 Like
7

thanks - i’m trying to create a repro locally now, will post back when i manage to duplicate it (or when i inevitably find the bug in my code causing it :/).