Presonus Studio One has recently changed to Fender Studio Pro. The re-naming causes the SSL 360 VST3 DAW integration features to stop working.
We will provide a full fix in SSL 360 v2.1 but in the meantime, you can use the following steps to temporarily solve and workaround the issue and get the VST3 DAW integration features working again.
Windows
When installing Studio One, change the name of the destination folder to include the words 'Studio One'.
C:\Program Files\Fender\Studio Pro 8
to
C:\Program Files\Fender\Studio One 8
Mac
Once Studio Pro is installed, create a folder called 'Studio One' in the Applications folder, and drag the Studio Pro 8 app inside that folder.