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The LabVIEW 2009 SP1 f1 patch fixes the following issues. If you are not experiencing one of these issues NI recommends that you do not install this patch. All of these issues have been fixed for LabVIEW 2010.
LabVIEW 2009 built DLLs, if called from another version of LabVIEW, may crash the calling version.
Loading multiple versions of the LabVIEW run-time engine can fail. LabVIEW can report a corrupt memory error.
LabVIEW Development Systems and Run-Time Systems will crash during load on certain CPUs. The only two known CPUs are EBox 3300 and GenuineTMx86 Model Number: 20040614.