Index: /trunk/psModules/src/imcombine/pmSubtractionMatch.c
===================================================================
--- /trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 14765)
+++ /trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 14766)
@@ -60,4 +60,8 @@
     )
 {
+    if (stampsData && *stamps) {
+        // We've already previously read all the stamps
+        return true;
+    }
 
     psImage *inImage = NULL; // Input image