just found this strange behaviour in a multi vvvv instances scenario:
something like you can only have DMX nodes in one instance!
open 1st vvvv instance
put a DMX (Network Artnet Sender or Receiver)
open 2nd vvvv instance (/allowmultiple)
try to add another DMX (Network Artnet Sender or Receiver)
nothing happen in the patch window!
but tty report
00:07:41 * : [MainLoop.TMMainLoop.DoTimer: error occured in Graph.TMBasicNode.PrepareGraphCB](MainLoop.TMMainLoop.DoTimer: error occured in Graph.TMBasicNode.PrepareGraphCB): Could not bind socket. Address and port are already in use.
00:07:41 - : To help us track this error down, enable the ExceptionDialog via the menu or starting vvvv with /showexceptions.