Hello All,    We have a grid computing environment running ROCKS 4.3 (sun grid engine) on which we have used GATE (version 3.1.2) successfully in the past albeit with parameterised phantoms. Leaving the parameterised attenuation phantom as it is, I changed the source phantom to a voxelised one (interfile, IEC IQ phantom Nb of planes:180 Nb of pixels per plane: 300 230 ) and noticed that the entire simulation crashes after a while. Looking at the log files, I can see nothing amiss.    Has anyone encountered this and if so, any suggestions as to how I fix this? Thanks, Karthik.