I can get all of the other custom machines made by @Platonymous to work with Custom Farming Redux, but for whatever reason, the Signage machines will spawn in the game, but don't allow me to actually add an item to display on the sign. I'm running the latest versions of SMAPI as well as Custom Farming Redux and Signage. Other people on the Nexus thread seem to be having the same problem but there have been no replies. Does anyone know a solution? Thanks!
I haven't been able to get it to work either. I've decided just to wait until the new game update drops and try the ones added by it.