I'm not sure what I did but suddenly when adding a generator I no longer get an option to select a generator option. It's just blank where the selectable field used to be.
I'm new to Substance so could have easily done something I don't understand. I'm 85% sure I'm adding a generator to the same layer type that was working earlier (a simple color fill layer).
1. Click on generator in the layers panel
2. Reset the library search to remove any previous searches
3. Type generators into the search bar
4. Select a generator
5 Drag it into the empty slot in the properties panel