I have two possible suggestions.
When I first set this up, I believe that 1) I had to set up an Actor first in the settings. This way it knew what it had access to. Could be wrong in that this wasn't required, but I think I recall that being limited until the Actor was set.
2) Once in the Configuration, are you just clicking and typing in the drop downs? Those are filters to items already created. You have to just click the Add button off to the right. This will give you a pop up with options to set up an item. I removed some items when I was first starting and then typed in the filter part and saw the same behavior you're describing. Just click the Add button to the right.
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