I click the button and it makes a noise but does not bring up the config screen. I hear from a friend it works on forge 2491. It doesn't work on 2707 (latest) or 2705 (recommended) or 2515. Can open config file from C:\Users\azu\AppData\Roaming.minecraft\config\Schematica.cfg just fine in another program just fine. Problem exists in entering options from both ingame and from main menu. Other mods' config buttons work.

Using:
Minecraft 1.12.2 with Forge (various releases)
LunatriusCore-1.12.2-1.2.0.42-universal
Schematica-1.12.2-1.8.0.169-universal
java runtime environment 8u171