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Not possible to read udp on a workstation with two network cards

The problem only occures when I'm running the program on a work station that has two NIC's.  When I use my development workstation (Lab VIEW 7.1 proffesional) that has only one NIC, the program reads UDP without any remarks on the same network connection as the designated workstation is using.
 
When I use the same program on the designated work station that has two network interfaces installed (2 separate LAN's) the udp read does not receive any datagrams. This work station has only the dístributed application and the runtime engine installed.
I've tried to alter the network card settings and their connections so that the network connection used by the program is using the other  NIC without any success.  
Anyway since there is no possibility to specify anything else than the port on which the udp read should listen on, I wonder how it could be possible to get this running.
 
Both systems are running XP and the only difference is that the system where the distributed application runs on has 2 NIC's.
 
I f anybody has had the same problem and maybe a solution to the problem, I would appreciate it.
 
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Is there still a problem receiving UDP on machines with multiple network cards?

I have built an application (.exe) to run on a Windows XP-64 box (not an LV development system) that needs to receive UDP packets from a real-time PXI chassis, and it doesn't seem to work. The application works if I run on my development computer, which is XP (not 64-bit) and only has a single network interface.

I'm running LV 8.5. Any help/clues would be appreciated.
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