No, it never behaved correctly. I am very inexperienced with LabVIEW. I was practicing building a front panel on a Windows 2000 machine with 6.0 eval. I wired the UDP Write as I described and tried to run it. Each time I clicked the button that activated the UDP "code", LabVIEW crashed. I copied the .VI to our Linux box with LabVIEW 6.1 Full Version and, when I brought it up, the line between the cluster and the UDP Write was dashed. I then changed the diagram so that all of the items in the cluster were converted to U8 using byte-swapping and word-splitting, converted it to a binary array, converted that to a string and sent the string to the UDP Write and cured the problem. I wanted the inputs into the cluster to have the exact data structure as defi
ned in the C header for readability.