diff --git a/src/backend/concrete_simulation.cc b/src/backend/concrete_simulation.cc
index 8ae3847..55650cd 100644
--- a/src/backend/concrete_simulation.cc
+++ b/src/backend/concrete_simulation.cc
@@ -209,10 +209,12 @@ ConcreteSimulation::get_history() const
 void
 ConcreteSimulation::set_policy(CPUPolicy* p) throw(CPUPolicyException)
 {
+  stop();
+
   // NOTE: restoring of the previous policy is done here because I
   // couldn't think of a clean way to do it
   // inside activate_policy()
-  
+ 
   try
   {
     CPUPoliciesGatekeeper::get_instance().activate_policy(&_history, p);
@@ -253,6 +255,7 @@ ConcreteSimulation::get_policy()
 void
 ConcreteSimulation::set_resource_policy(ResourcePolicy* p)
 {
+  stop();
   ResourcePoliciesGatekeeper::get_instance().activate_policy(&_history, p);
   _resource_policy = p;
 }
diff --git a/src/holt_widget.cc b/src/holt_widget.cc
index 940a3c9..84da713 100644
--- a/src/holt_widget.cc
+++ b/src/holt_widget.cc
@@ -208,9 +208,9 @@ void HoltSchedulable::draw(cairo_t *cr)
       break;
     case Schedulable::state_blocked:
       // cairo_set_source_rgb (cr, 1, 0, 0);
-      // blue
-      cairo_pattern_add_color_stop_rgba(gradient, 0.00, 0.5, 0.5, 1.0,  0.7);
-      cairo_pattern_add_color_stop_rgba(gradient, 1.00, 0.0, 0.0, 1.0,  1.0);
+      // red
+      cairo_pattern_add_color_stop_rgba(gradient, 0.00, 1.0, 0.5, 0.5,  0.7);
+      cairo_pattern_add_color_stop_rgba(gradient, 1.00, 1.0, 0.0, 0.0,  1.0);
       cairo_set_source(cr, gradient);
       break;
     case Schedulable::state_future:
@@ -276,8 +276,8 @@ void HoltRequest::draw(cairo_t *cr)
   switch(_state)
   {
     case Request::state_unallocable:
-      // blue
-      cairo_set_source_rgb(cr, 0, 0, 1);
+      // red
+      cairo_set_source_rgb(cr, 1, 0, 0);
       arrow(cr, schedulable, resource);
       break;
     case Request::state_allocated:
diff --git a/src/simulation_widget.cc b/src/simulation_widget.cc
index 452ce76..44709df 100644
--- a/src/simulation_widget.cc
+++ b/src/simulation_widget.cc
@@ -703,8 +703,8 @@ SimulationWidget::make_gradients()
   cairo_pattern_add_color_stop_rgba(_running_process_gradient, 1.00, 0.0, 1.0, 0.0,  1.0);
   
   _blocked_process_gradient = cairo_pattern_create_linear(0, 0, 0, _yu_process_bar_height * _y_unit);
-  // blue
-  cairo_pattern_add_color_stop_rgba(_blocked_process_gradient, 0.00, 0.5, 0.5, 1.0,  0.7);
-  cairo_pattern_add_color_stop_rgba(_blocked_process_gradient, 1.00, 0.0, 0.0, 1.0,  1.0);
+  // red
+  cairo_pattern_add_color_stop_rgba(_blocked_process_gradient, 0.00, 1.0, 0.5, 0.5,  0.7);
+  cairo_pattern_add_color_stop_rgba(_blocked_process_gradient, 1.00, 1.0, 0.0, 0.0,  1.0);
 }