Patch reset vector values during init.

tbox/src/wLine2.cpp

@@ -160,6 +160,7 @@ void Line2::buildGradientV(int dim)
     GaussLine2 &gauss = getCache(order).gauss;
 
     // Gradient of volume
+    gradVol.clear();
     gradVol.resize(2 * dim, 0.); // 2 nodes
     for (size_t k = 0; k < gauss.getN(); ++k)
     {

tbox/src/wTetra4.cpp

@@ -171,6 +171,7 @@ void Tetra4::buildGradientV(int dim)
     GaussTetra4 &gauss = getCache(order).gauss;
 
     // Gradient of volume
+    gradVol.clear();
     gradVol.resize(4 * dim, 0.); // 4 nodes
     for (size_t k = 0; k < gauss.getN(); ++k)
     {

tbox/src/wTri3.cpp

@@ -225,6 +225,7 @@ void Tri3::buildGradientV(int dim)
     GaussTri3 &gauss = getCache(order).gauss;
 
     // Gradient of volume
+    gradVol.clear();
     gradVol.resize(3 * dim, 0.); // 3 nodes
     for (size_t k = 0; k < gauss.getN(); ++k)
     {