I just realised I forgot to report a potential bug in the latest SPIS version. I am using the particle detector tool to trace particles, and found a potential bug in the latest version. I am using the ASCII output files to analyze the results (particularly the Velocity2DF-files), but in the latest version the information in these files look very strange. The velocity distribution is zero everywhere except in one plane (the vz = 0 plane, if I recall correctly). The outputs look correct otherwise when checking the particle trajectories etc., so SPIS seems to be doing the right thing. It just does not print the correct thing to the ASCII files. Running the same simulation in an older SPIS version works fine.