<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7226.0"> <TITLE>gateSingles empty</TITLE> </HEAD> <BODY>  Hi, I've got, what I thought, would be a straightforward simulation written up. A beam source pointed straight at my detector. Unfortunately it does not seem to register any Singles when it is run. Could there be something obvious or basic I've done wrong? I've got the macro ready to send to anyone who wants a look. Thanks for you help. Monu </BODY> </HTML>