I have two plugins, Fors Pivot (v1.1.0) and Synchrony Symbolic Music (v1.0.6), that have been successfully installed, show up no problem in the plugin manager, but just don't show up in the plugin list. Both are instruments, so it's not like I'm looking for a surround processor in a stereo track or anything. If I use a chainer like Blue Cat's Patchwork both load from the AU versions without issue. They just aren't in the plugin list. In the case of Pivot, I also have installed another synth, Junior, from the same dev, and it works no problem. I'm not about to die on a hill for either of these, but I'm intensely curious as to whether anyone else has had this problem with these or any other plugins.

Mac Studio M1 64GB, Sequoia v 15.7.5

 

The plugin list of what?

 

Did you try xattr/codesign fixes? Hopefully you already did..

sudo xattr -cr "/Library/Audio/Plug-Ins/Components/Plugin.component"

codesign --force --deep --sign - "/Library/Audio/Plug-Ins/Components/Plugin.component"

Go to Logic Pro → Settings → Plug-in Manager and look at the developer list on the left side first. Since it’s alphabetical, it’s often the fastest way to see whether the developer is even being detected by Logic at all.

You can also click the “Compatibility” column on the right side to sort the plugins. The successfully validated plugins will group together, and anything that failed validation, crashed during scan, or was skipped usually becomes easier to spot near the bottom.

Since it loads fine as an AU inside PatchWork, the plugin itself probably works.

On Apple Silicon Macs, another thing worth trying is launching Logic itself under Rosetta once, letting the plugin scan there, then switching Logic back to native mode afterward. Sometimes that’s enough to get plugins recognized.

Otherwise, rebooting or clearing Logic’s plugin cache and forcing a rescan can also fix it.

I'm on Catalina, so these are just some tricks you can try.

 

Yes, I have. Other than @clone's excellent advice and tips, I can tell you that I've encountered a similar issue with some of my Roland plugins (D-50 etc) when I updated my OS and Logic. I could load and use them (the D-50 and others) in DSP-Quattro, but not in Logic.

The issue seems to have been that Logic relied (then) on some files/libraries that came with iTunes. When I updated my OS, and my blue iTunes icon was replaced by the red Music App icon, those libraries were no longer available - and Logic apparently relied on them.

Eventually, Roland Cloud released an update, which I installed, and which restored all Roland plugins access in Logic - all good now.

The above background and preamble for the only tips I've got that :

• 1) if you're not using ware'd versions, contact the developers and ask them for an update (or manual installers)
• 2) if you are using ware'd versions, then try to find a standalone iTunes installer, install it, re-install the two plugins