Unable to add control surface

Robert Wilson

I am trying to add a control surface in Logic 10.5.1.
In Control Surface Setup, I select New then Scan All Models, and receive a message telling me that if my model is in italics I need to click Add to add it manually.
When I select the model I want (or any other model in italics) and click Add, nothing happens.
If I select a model not in italics and click Add it is added.

Does anyone have a work around for this or know if it's a bug? (I don't recall having this issue with previous versions.)