I am porting some old plugins so that newer Macs can use them. I have followed all the steps I think:
I set the signing options to Developer ID Application and the account has a paid subscription.
I tried setting macOS Deployment Target to Sequoia but also Monterey because some testers had that. Same problem with both I think.
I did the notarization and staple steps.
It all works on the volume I compile on, but on others auval/Logic says cannot open -1. Reaper Says cannot load on adding the plugin, but it did scan correctly. Garage band is the same I think, it scans it but shows a blank GUI window.
The compiling volume is Sequoia 15.6.1 and XCode 26. I can’t think of anything to try except compiling with an earlier version of MacOS and XCode. Any suggestions?
Edit: Made some progress during the day, there’s an error message about Symbol not found, Expected in: … /usr/lib/libc++.1.dylib
But, the Juce Example Plugin didn’t have the problem at all so I am remaking the projects to duplicate that.