diff --git a/src/backend/concrete_history.cc b/src/backend/concrete_history.cc
index 67c7f2a..5628122 100644
--- a/src/backend/concrete_history.cc
+++ b/src/backend/concrete_history.cc
@@ -20,8 +20,6 @@
 
 #include "config.h"
 
-#include "concrete_history.hh"
-
 #include "dynamic_process.hh"
 #include "dynamic_thread.hh"
 #include "dynamic_resource.hh"
@@ -34,6 +32,9 @@
 #include "static_request.hh"
 #include "static_sub_request.hh"
 
+#include "history_observer.hh"
+#include "concrete_history.hh"
+
 #include "smartp.tcc"
 
 #include <algorithm>
@@ -145,32 +146,37 @@ ConcreteHistory::remove(resource_key_t resource_key)
 	delete found->second;
 	resources.erase(found);
 
+	// Now search and erase subrequest that had a ref to the 
+	// removed resource
+
+	typedef std::vector<DynamicThread*> Threads;
+	typedef std::vector<DynamicRequest*> Requests;
+	typedef std::vector<DynamicSubRequest*> SubRequests;
+
 	// Listening to "The Thing That Should Not Be"...
 	// all hail the cyclomatic complexity!
 	ConcreteEnvironment::Processes& processes = initial.get_processes();
 	typedef ConcreteEnvironment::Processes::iterator ProcIt;
 	for(ProcIt it1 = processes.begin(); it1 != processes.end(); it1++)
 	  {
-	    typedef std::vector<DynamicThread*> Threads;
 	    Threads& threads = dynamic_cast<DynamicProcess&>(**it1).get_dynamic_threads();
 	    for(Threads::iterator it2 = threads.begin(); it2 != threads.end(); it2++)
 	      {
-					typedef std::vector<DynamicRequest*> Requests;
 					Requests& reqs = (*it2)->get_dynamic_requests();
 					for(Requests::iterator it3 = reqs.begin(); it3 != reqs.end(); it3++)
 						{
-							typedef std::vector<DynamicSubRequest*> SubRequests;
 							SubRequests& subr = (*it3)->get_dynamic_subrequests();
-							for(SubRequests::iterator it4 = subr.begin(); it4 != subr.end(); it4++)
-								{
-									if((*it4)->get_resource_key() == resource_key)
-										{
-											delete *it4;
-											subr.erase(it4);
-										}
-								}
+							SubRequests::iterator it4 = subr.begin(); 
+							while(it4 != subr.end())
+								if((*it4)->get_resource_key() == resource_key)
+									{
+										delete *it4;
+										it4 = subr.erase(it4);
+									}
+								else
+									it4++;
 						}
-	      }
+				}
 	  } //~ end monstrous construct, "The Thing That Should Not Be"
 	// Chtulhu ftaghn. There are worse things in life. Mother-in-laws,
 	// for example. Or hangovers. Or being read poetry by a Vogon.
@@ -395,5 +401,7 @@ ConcreteHistory::reset(bool notify)
 void
 ConcreteHistory::notify_change()
 {
-  // FIXME write code for this method. won't link without this stub
+	History::RegisteredObservers::iterator it;
+	for(it =_observers.begin(); it != _observers.end(); it++)
+		(*it)->update(*this);
 }
diff --git a/src/backend/policies_gatekeeper.cc b/src/backend/policies_gatekeeper.cc
index 1f88bc7..183fe87 100644
--- a/src/backend/policies_gatekeeper.cc
+++ b/src/backend/policies_gatekeeper.cc
@@ -125,14 +125,16 @@ PoliciesGatekeeper::deactivate_policies(PolicyManager* manager)
     // library utilities?
     ActiveIterator act_it = _active_policies.begin();
 
-    for(; act_it != _active_policies.end(); ++act_it)
-    {
-      if(act_it->second == *avail_it)
-      {
-        act_it->second->deactivate();
-        _active_policies.erase(act_it);
-      }
-    }
-  }
+		while(act_it != _active_policies.end())
+			{
+				if(act_it->second == *avail_it)
+					{
+						act_it->second->deactivate();
+						act_it = _active_policies.erase(act_it);
+					}
+				else 
+					act_it++;
+			}
+  } //~ for(avail_it)
 }