It was discovered after the release of Dorico 4.0.30 yesterday that the update contained a bug that prevented the list of VST effects from appearing in the Inserts section of the Mixer. We’re very sorry for the inconvenience caused by this bug, and have today issued a hotfix, version 4.0.31, that addresses it.
If you have already installed Dorico 4.0.30, run Steinberg Download Assistant, choose Dorico Pro 4, Dorico Elements 4 or Dorico SE 4 as appropriate, and you will see Dorico 4.0.31 Application Installer at the top of the list: simply download and install this. Run Dorico 4, and check in Help > About Dorico (in the Dorico menu on macOS) that you are now running version 4.0.31 build 1060.
Once again, we apologise for the inconvenience caused by the introduction of this bug. Onwards and upwards!