Copy/Paste and Drag/Drop issue

I have a Primary and 2 Secondaries running Multiplicity 3.44.

I can Copy/Paste and Drag/Drop between Primary and Secondary 1 in both directions.

I cannot Copy/Paste or Drag/Drop between Primary and Secondary 2 (in either direction).  It seems something is not configured correctly on Secondary 2.

On the chance it's a Windows Firewall setting I checked that all the allowed apps on Sec 2 were the same as in the list on Sec 1 and they are.

Can anyone suggest how to fix this?

TIA

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