Index: trunk/psModules/src/imcombine/pmSubtractionKernels.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionKernels.c	(revision 14315)
+++ trunk/psModules/src/imcombine/pmSubtractionKernels.c	(revision 14317)
@@ -472,5 +472,5 @@
     }
 
-    kernels->subIndex = kernels->inner + numInner / 2;
+    kernels->subIndex = kernels->inner + (numInner - 1) * numSpatial / 2;
     assert(kernels->u->data.S32[kernels->subIndex] == 0 &&
            kernels->v->data.S32[kernels->subIndex] == 0 &&