--- branches/development/src/nonbonded/LJ.cpp	2011/04/08 21:25:19	1545
+++ branches/development/src/nonbonded/LJ.cpp	2011/04/27 18:38:15	1549
@@ -279,7 +279,7 @@ namespace OpenMD {
       }
 
       RealType pot_temp = idat.vdwMult * epsilon * (myPot - myPotC);
-      idat.vpair[0] += pot_temp;
+      idat.vpair += pot_temp;
       
       RealType dudr = idat.sw * idat.vdwMult * epsilon * (myDeriv - 
                                                           myDerivC)*sigmai;