Jim,
My apologies for the miscommunication on my part. That is a much more difficult question. I went and checked into this issue for you and was able to reproduce your error. I tested the communication between DataSocket and a Shared Variable on Windows machines, but was having that exact error when communicating between a shared variable on a Windows PC and DataSocket on a Mac. I will go ahead and report this issue to R&D. Thanks very much for helping make LabVIEW a better product in the future.
Have a great day!
Andy F.
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National Instruments