Ableton Forum

I had the same issue after Installing Live 12 and a macOS Update.

The thing is that this Plug-in is not "Apple Certified".

So you will need to "quarantine" the Apple certification on the AU (.componant) and the VST2 (.vst)

To do this :

Open the Terminal and type/paste :

For the VST.

sudo xattr ...

Same thing here, just bought the last 15" Mac Book Pro retina, and ableton looks "blurry" :/