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Are you sure you're capturing in the same interface the UDP packets are being transmitted from?
It appears that, by default, Packet Sender doesn't bind to a particular source IP (and hence interface) unless specified, so will use the interface with the best route to the destination address.
The other issue may be your "debugging" board isn't responding to ARP requests so the sending PC can't get a MAC address to send to. Do you see ARP requests, if not try capturing with a less restrictive filter?
