before shadow2DArray try

src/core/scene/globject.cpp

@@ -634,6 +634,7 @@ ObjectBase * Light::clone(bool withChildren) {
 	o->decay_linear    = decay_linear;
 	o->decay_quadratic = decay_quadratic;
 	o->meta            = meta;
+	o->shadow_map.reinit();
 	return o;
 }
 

src/core/scene/glscene.cpp

@@ -113,6 +113,10 @@ void Scene::reinitAll() {
 		i->reinit();
 	for (auto * i: td_geometries)
 		i->reinit();
+	auto aol = root_->children(true);
+	for (auto * i: aol) {
+		if (i->type() == ObjectBase::glLight) ((Light *)i)->shadow_map.reinit();
+	}
 	setTreeChanged();
 	mat_changed = lights_changed = true;
 	need_reload_materials        = true;

src/qglview_test/qglview_window.cpp

@@ -41,7 +41,10 @@ public:
 	}
 	~Effect1() { deleteShader(mys); }
 	QString name() const { return "Blur"; }
-	void reloadShaders() { QGLEngineShaders::loadShadersMulti(mys, "test1.glsl"); }
+	void reloadShaders() {
+		deleteShader(mys);
+		QGLEngineShaders::loadShadersMulti(mys, "test1.glsl");
+	}
 	void draw() {
 		if (!mys) return;
 		if (!mys->isLinked()) return;