Hello Jedi,
In the CueluxPro patch page, you can change both the 'destination IP address' and the sub.uni for Art-Net (as Boyd correctly suggested, thanks for the support). If I understand your last post correctly, you are selecting the IP address of the CueCore as destination. This means that all Art-Net packets will travel from you Computer that sent out the Art-Net to the CueCore. Thus, any other PC, including the one running the visualizer, will not receive the data stream.
What you could do is change the destination IP address to a broadcast address. For example 192.168.2.255 would broadcast the Art-Net to all network devices in your subnet. Changing the Art-Net field to 192.168.2.255 @ 0.0 should resolve your problem.
I hope this helps,
best regards,
Jurrien