PlusMD crashes Mantid in conjuction with SliceViewer

[abuts]

Original Owner: @jzikovsky

This ticket is blocked by :

• TRAC4641

The script below crashes release Mantid under windows with 100% probability on one of PlusMD operation (rows 17,18,19) after 2-13 iterations.

This happens only when SliceViewer row (20) is enabled.

Does not happen for Debug Mantid though. I suspect that it is because it does not brings SliceViewer up.

WS_Name = 'CNCS_7860_event'
Load(Filename='CNCS_7860_event.nxs',OutputWorkspace=WS_Name )
ConvertUnits(InputWorkspace=WS_Name,OutputWorkspace=WS_Name,Target='DeltaE',EMode='Direct',EFixed='3')
Rebin(InputWorkspace='CNCS_7860_event',OutputWorkspace=WS_Name,Params='-1,0.05,3',PreserveEvents=True)
SetUB(Workspace=WS_Name,a='5.4165',b='5.4165',c='5.4165',u='1,0,0',v='0,1,0')
#AddSampleLog(Workspace=WS_Name,LogName='Ei',LogText='3',LogType='Number')

for i in range(0,20,1):
    TWS='MD1'
    for i in range(0,20,5):
        CloneWorkspace(InputWorkspace=WS_Name,OutputWorkspace='preMDpart'+str(i))
        AddSampleLog(Workspace='preMDpart'+str(i),LogName='Psi',LogText=str(i),LogType='Number Series')
        SetGoniometer(Workspace='preMDpart'+str(i),Axis0='Psi,0,1,0,1')
        ConvertToMDEvents(InputWorkspace='preMDpart'+str(i),OutputWorkspace='MDpart'+str(i),QDimensions='QhQkQl',u="1,0,0",v="0,1,0",dEAnalysisMode='Direct',MinValues='-2,-2,-3,-1',MaxValues='2,2,3,3',SplitInto="20,20,1,1")
    PlusMD(LHSWorkspace='MDpart0',RHSWorkspace='MDpart5',OutputWorkspace=TWS)
    PlusMD(LHSWorkspace=TWS,RHSWorkspace='MDpart10',OutputWorkspace=TWS)
    PlusMD(LHSWorkspace=TWS,RHSWorkspace='MDpart15',OutputWorkspace=TWS)
    plotSlice(TWS, xydim=["Q1","Q2"],slicepoint=[0,0] )

[abuts]

This issue was originally trac ticket 4516