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I only have one-way communication

This applies to Sigma, Nucleus, Matrix, AWS and Duality

One-way communication generally has to do with your network IGMP multicast capability. Additionally, some TP-Link brand switches do not handle multicast correctly.

Search our articles for multicast for information on how to resolve by changing your network connection arrangement or switch:

There is a specific instance having to do with Pro Tools 10.2 and may affect other versions:

This may happen if you are not running Pro Tools as an administrator. To run any application as administrator, right-click the app icon and click "Run as administrator."

A case has been observed where Pro Tools responded normally to SSL control surface data, but control data from Pro Tools would not correctly reach the SSL.

For example, while the SSL faders would correctly control Pro Tools on-screen faders, moving a fader in the Pro Tools would not cause the corresponding Nucleus fader to move.

Running Pro Tools as administrator resolved this issue.