1) download this app
2) exit Logic. Run the downloaded app to enable the "Validate All AUs" mode, re-launch Logic & re-scan your not valid AUs in Logic to get them validated! You'll get rid this way of the [Incompatible] plugin menu voice, and the startup message warning you're using Incompatible Audio Units.
3) re-launch the app and click Disable. That way all will be back to normal, and validated AUs will remain validated