Some Logic Pro users experience an issue where Logic Pro stops updating the surface after using a fader or button on the surface. We have demonstrated the problem to Apple but they have not provided a fix. There is a workaround that works for most users.
1. Quit Logic Pro.
2. Download and install V-COntrol Pro 3.0.16 or later at https://neyrinck.com/downloads/v-control-pro.
3. Launch V-Control Pro and open V-Control Pro Preferences.
4. Enable the “Logic Pro IPv6” preference.
5. Quit V-Control Pro.
6. Launch V-Control Pro.
7. Launch Logic Pro.