I’m having this issue as well with version 4.6.7. Bought JCInventory on the market and have spent months trying to integrate it into my project. It’s all come down to this, selecting the JCInventoryPlayerInterface in my character pawn’s class settings. It shows in the drop down menu but when I click it, nothing happens. I can add other interfaces, but not that one. I went into the demo character provided in the package and removed the interface from the class settings and it wouldn’t allow me to add it back in. What stops an interface from being used in another pawn class settings or being added after it’s removed?
I’m going to dig through the documentation because so far I can’t find help.