Index: trunk/psModules/src/imcombine/pmStack.c
===================================================================
--- trunk/psModules/src/imcombine/pmStack.c	(revision 42830)
+++ trunk/psModules/src/imcombine/pmStack.c	(revision 43036)
@@ -1646,5 +1646,9 @@
 		// accumulate exposure times if required
 		if (expTime)  { expTime->data.F32[nGood] = data->exp; }
-		expWeight->data.F32[nGood] = data->exp;
+		if (0) {
+		  expWeight->data.F32[nGood] = data->exp; // old value
+		} else {
+		  expWeight->data.F32[nGood] = data->weight; // new value
+		}
 		nGood ++;
 	    }