creator.c wasn't updated in my last commit, here it is (the change reverts my previous change to it, since it was made unnecessary by handling onload scriptlinks a little differently, as can be checked in blender.c and editscreen.c).

- BPython:  finishing object and nmesh .setMaterials commit, fixing two bugs.  Also fixed a crash with object.track (pointer wasn't checked for validity).  All based on reports and patch by Yann Vernier, thanks again.

source/blender/python/api2_2x/Material.c

@@ -1835,26 +1835,26 @@ int EXPP_synchronizeMaterialLists (Object *object)
 {
 		Material	*** p_dataMaterials = give_matarar (object);
 		short				* nmaterials = give_totcolp (object);
+		int result = 0;
 
 		if (object->totcol > *nmaterials) {
 				/* More object mats than data mats */
-				*nmaterials = object->totcol;
-				return expandPtrArray ((void *) p_dataMaterials,
+				result = expandPtrArray ((void *) p_dataMaterials,
 															 *nmaterials,
 															 object->totcol);
+				*nmaterials = object->totcol;
 		}
 		else {
 				if (object->totcol < *nmaterials) {
 						/* More data mats than object mats */
-						object->totcol = *nmaterials;
-						return expandPtrArray ((void *) &object->mat,
+						result = expandPtrArray ((void *) &object->mat,
 																	 object->totcol,
 																	 *nmaterials);
+						object->totcol = *nmaterials;
 				}
-		}
+		} /* else no synchronization needed, they are of equal length */
 
-		/* No synchronization is needed; they're of equal length */
-		return 1;
+		return result; /* 1 if changed, 0 otherwise */
 }
 
 void EXPP_incr_mats_us (Material **matlist, int len)

source/blender/python/api2_2x/NMesh.c

@@ -818,7 +818,7 @@ static PyObject *NMesh_setMaterials (PyObject *self, PyObject *args)
 	BPy_NMesh *me = (BPy_NMesh *)self;
 	PyObject *pymats = NULL;
 
-	if (!PyArg_ParseTuple (args, "O!", &PyList_Type, pymats))
+	if (!PyArg_ParseTuple (args, "O!", &PyList_Type, &pymats))
 		return EXPP_ReturnPyObjError (PyExc_TypeError,
 			"expected a list of materials (None's also accepted) as argument");
 

source/blender/python/api2_2x/Object.c

@@ -1570,21 +1570,21 @@ static PyObject *Object_setMaterials (BPy_Object *self, PyObject *args)
 		if ((len < 0) || (len > MAXMAT))
 		{
 			return (EXPP_ReturnPyObjError (PyExc_RuntimeError,
-				"illegal material index!"));
+				"material list should have at least 1, at most 16 entries"));
 		}
 
 		if (self->object->mat)
 		{
-			EXPP_releaseMaterialList (self->object->mat, len);
+			EXPP_releaseMaterialList (self->object->mat, self->object->totcol);
 		}
 		/* Increase the user count on all materials */
 		for (i=0 ; i<len ; i++)
 		{
-			id_us_plus ((ID *) matlist[i]);
+			if (matlist[i]) id_us_plus ((ID *) matlist[i]);
 		}
 		self->object->mat = matlist;
 		self->object->totcol = len;
-		self->object->actcol = -1;
+		self->object->actcol = len;
 
 		switch (self->object->type)
 		{
@@ -1993,6 +1993,8 @@ PyObject* Object_CreatePyObject (struct Object *obj)
 {
 	BPy_Object	  * blen_object;
 
+	if (!obj) return EXPP_incr_ret (Py_None);
+
 	blen_object = (BPy_Object*)PyObject_NEW (BPy_Object, &Object_Type);
 
 	if (blen_object == NULL)

source/creator/creator.c

@@ -197,7 +197,6 @@ int main(int argc, char **argv)
 	int a, i, stax, stay, sizx, sizy;
 	SYS_SystemHandle syshandle;
 	Scene *sce;
-	short onload_script = 0;
 
 #if defined(WIN32) || defined (__linux__)
 	int audio = 1;
@@ -257,7 +256,7 @@ int main(int argc, char **argv)
 
 	/* first test for background */
 
-	onload_script = 1; /* scenescript always set! */
+	G.f |= G_SCENESCRIPT; /* scenescript always set! */
 
 	for(a=1; a<argc; a++) {
 
@@ -294,7 +293,7 @@ int main(int argc, char **argv)
              break;
 
 			case 'y':
-				onload_script = 0;
+				G.f &= ~G_SCENESCRIPT;
 				break;
 
 			case 'Y':
@@ -576,11 +575,6 @@ int main(int argc, char **argv)
 		set_scene(sce);
 	}
 
-	/* We set the ONLOAD script global flag here, when the screen has already
-	 * been set and the rendering context initialized.  If there's an onload
-	 * script it will be executed in screenmain. */
-	if (onload_script) G.f |= G_SCENESCRIPT;
-
 	screenmain();
 
 	return 0;