ConvertToMD segfaults when run through NX

[mantid-builder]

Original Reporter: @DennisMikkelson

This is a peculiar problem. If the following simple script is run through an NX session on the SNS analysis cluster, ConvertToMD will seg fault. If the same script is run through an SSH session instead, it works correctly. The script is:

import sys

sys.path.append("/opt/mantidnightly/bin")

from mantidsimple import *

file_name = "/SNS/TOPAZ/IPTS-4822/0/3857/NeXus/TOPAZ_3857_event.nxs"

LoadEventNexus( Filename=file_name, OutputWorkspace='TOPAZ_events', FilterByTofMin='500', FilterByTofMax='16000' )

ConvertToMD( InputWorkspace='TOPAZ_events', OutputWorkspace='TOPAZ_MD', QDimensions="Q3D",
dEAnalysisMode="Elastic", QConversionScales="Q in A^-1",
LorentzCorrection='1', MinValues="-50,-50,-50", MaxValues="50,50,50",
SplitInto='2', SplitThreshold='50',MaxRecursionDepth='12')

sys.exit()

[mantid-builder]

This issue was originally trac ticket 6431