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I built simple voltage divider circuit and noticed that when using a probe with reference to another probe, the voltage is not properly displayed in labview (it works in multisim). It is shown as total voltage referenced to the ground (not to the other probe as it should be). Please see the attachments from LV and multisim.
In your VI, you set R1 to 0ohm and this value is passed to Multisim, therefore, the result you see in LabVIEW is correct. Set R1 to 1K in LabVIEW and you will see 6V.