Christian is correct. In the code I posted the part that "reads then writes" the global has a classic race condition.
Race scenario:
VI_1 - Reads Global but hasn't written a new value yet
VI_2 - Writes global with update
VI_1 - Writes global with old global value -> VI_2 update is lost
I had intended to make that code section into a non-reentrant subvi, but got distracted.
Testing seemed to work but that is because data was being updated continually
which masked the issue.
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Founding (and only) member of AUITA - the Anti UI Thread Association.
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