Probe is not working for class with variable refnum

I have a class whose purpose is to send data through a network stream. Its private data consists of an array of typedef clusters and a single variable refnum of the network stream writer. If I try to probe a wire whose data type is this class, it simply states "No Debug Info" and displays the private data grayed out without any data in it. The probes do not work in member VIs or non-member VIs. But if I remove the variable refnum, then the probe works fine and I can see the array of typedefs. If I unbundle the class and probe the array and refnum then the probes display the data correctly.
Why is the variable refnum in the private data breaking the class's probe? Is there a workaround other than unbundling and probing?

Hello Arthur,
Would you be able to attach the simplest version of a program that has this probe issue? This will help me troubleshoot a lot better.
Ben D.
Applications Engineer
National Instruments

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Anatoli,
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If changing the Umlaut ü to something like ue in the Sender or Receiver Name everything is alright!
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Probe is not working for class with variable refnum

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