Sorry for this going into the weekend. I didn't really get a chance before now... I apparently fixed the problem I was having with finding tracks, but wanted to make sure it was valid and not just ad hoc voodoo that doesn't make sense from a simulation standpoint. Long story short: I traced the problem to SiTrackerHits not being assigned in 'DataTrackerHitDriver', and replacing it with 'TrackerDigiDriver' fixed it. TrackerDigiDriver is apparently supposed to be used with TrackerReconDriver anyway, according to a comment, so what is the reason for DataTrackerHitDriver being used in its place for 2014Recon? (This would be a great learning experience for me) Brad ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1