NI Software Installations Result in Unexpected Downgrades on Mac OS X

Updated Feb 7, 2018

Reported In


  • LabVIEW 2014 Full
  • LabVIEW 2014 Base


  • NI-VISA 14.0
  • NI-DAQmx Base 14.0
  • NI-488.2 14.1

Operating System

  • Mac OS X

Issue Details

When installing National Instruments software on Mac OS X released prior to August 2014, the installation may result in downgrading some software components unexpectedly. This can cause various symptoms, including crashes, hangs, and unexpected behavior. 

Specifically, the most common problems reported have been due to an unexpected downgrade of NI-PAL. NI-PAL is an underlying software component that provides needed functionality for many of National Instruments drivers. For example, installing NI-VISA 5.2 on a computer that already has NI-VISA 5.4.1 installed will result in NI-PAL partially downgrading from version 2.9.1 to version 2.6. This unexpected downgrade could then affect the use of NI-VISA as well as other drivers installed on the system.


This issue on Mac OS X has been addressed starting in the following versions:
  • LabVIEW 2014
  • NI-VISA 14.0
  • DAQmx Base 14.0
  • NI-488.2 14.1
Upgrading all National Instruments software to the versions listed above should resolve the issue. If you are unable to do so, please contact National Instruments Support to determine what component was unexpectedly downgraded. 

If you suspect that NI-PAL has been downgraded, then reinstalling the driver that provided the most recent version of NI-PAL should resolve the issue. If you do not know which driver to reinstall, please contact National Instruments Support for assistance.


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