Hi, according to http://www.slac.stanford.edu/BFROOT/www/Computing/Offline/Production/ the releases we should use to generate the D**lnu MC are: SP6 release: 14.4.7c (Run 4) SP5 release: 12.6.1a (Runs 1-3) I'm not sure if this is the correct release for SP8: SP8 release: 18.6.1l (Runs 1-5 up to Oct 2006) Cheers, Heiko