diff --git a/src/ce_editor.pas b/src/ce_editor.pas
index 64ac8a4d..00fe4d88 100644
--- a/src/ce_editor.pas
+++ b/src/ce_editor.pas
@@ -106,6 +106,7 @@ end;
 
 destructor TCEEditorWidget.destroy;
 begin
+  EntitiesConnector.removeObserver(self);
   tokLst.Free;
   errLst.Free;
   inherited;
@@ -120,6 +121,7 @@ end;
 
 procedure TCEEditorWidget.docClosing(const aDoc: TCESynMemo);
 begin
+  if fDoc <> aDoc then exit;
   fDoc := nil;
 end;
 
@@ -146,6 +148,7 @@ end;
 
 procedure TCEEditorWidget.projClosing(const aProject: TCEProject);
 begin
+  if fProj <> aProject then exit;
   fProj := nil;
 end;
 
@@ -156,6 +159,7 @@ end;
 
 procedure TCEEditorWidget.projChanged(const aProject: TCEProject);
 begin
+  fProj := aProject;
 end;
 
 procedure TCEEditorWidget.projCompile(const aProject: TCEProject);
@@ -238,14 +242,9 @@ begin
   memo.OnKeyUp := @memoKeyDown;
   memo.OnKeyPress := @memoKeyPress;
   memo.OnMouseDown := @memoMouseDown;
-  //memo.OnChange := @memoChange;
-
   memo.OnMouseMove := @memoMouseMove;
   //
   pageControl.ActivePage := sheet;
-
-  //http://bugs.freepascal.org/view.php?id=26320
-  //focusedEditorChanged;
 end;
 
 procedure TCEEditorWidget.removeEditor(const aIndex: NativeInt);
diff --git a/src/ce_interfaces.pas b/src/ce_interfaces.pas
index c96547d6..7c76ef3c 100644
--- a/src/ce_interfaces.pas
+++ b/src/ce_interfaces.pas
@@ -127,7 +127,8 @@ type
 
 implementation
 
-
+uses
+  ce_main;
 
 function TCEMultiDocSubject.acceptObserver(aObject: TObject): boolean;
 begin
diff --git a/src/ce_main.lfm b/src/ce_main.lfm
index 2077dbaf..444f8004 100644
--- a/src/ce_main.lfm
+++ b/src/ce_main.lfm
@@ -3044,20 +3044,4 @@ object CEMainForm: TCEMainForm
     OnShowHint = ApplicationProperties1ShowHint
     left = 96
   end
-  object LfmSyn: TSynLFMSyn
-    DefaultFilter = 'Fichiers fiches Lazarus (*.lfm)|*.lfm'
-    Enabled = False
-    CommentAttri.Foreground = clGreen
-    CommentAttri.FrameEdges = sfeAround
-    IdentifierAttri.Foreground = clBlack
-    IdentifierAttri.FrameEdges = sfeAround
-    KeyAttri.Foreground = clNavy
-    KeyAttri.FrameEdges = sfeAround
-    NumberAttri.Foreground = clPurple
-    NumberAttri.FrameEdges = sfeAround
-    SpaceAttri.FrameEdges = sfeAround
-    StringAttri.Foreground = clBlue
-    StringAttri.FrameEdges = sfeAround
-    left = 128
-  end
 end
diff --git a/src/ce_main.pas b/src/ce_main.pas
index 0b9047ec..7591da5c 100644
--- a/src/ce_main.pas
+++ b/src/ce_main.pas
@@ -166,7 +166,6 @@ type
     MenuItem7: TMenuItem;
     MenuItem8: TMenuItem;
     MenuItem9: TMenuItem;
-    LfmSyn: TSynLFMSyn;
     procedure actEdFindExecute(Sender: TObject);
     procedure actEdFindNextExecute(Sender: TObject);
     procedure actFileAddToProjExecute(Sender: TObject);
@@ -682,6 +681,7 @@ end;
 
 destructor TCEMainForm.destroy;
 begin
+  EntitiesConnector.removeObserver(self);
   SaveSettings;
   //
   KillPlugs;
@@ -900,6 +900,7 @@ end;
 
 procedure TCEMainForm.docClosing(const aDoc: TCESynMemo);
 begin
+  if aDoc <> fDoc then exit;
   fDoc := nil;
 end;
 
@@ -910,6 +911,7 @@ end;
 
 procedure TCEMainForm.docChanged(const aDoc: TCESynMemo);
 begin
+  fDoc := aDoc;
 end;
 {$ENDREGION}
 
@@ -1158,7 +1160,6 @@ end;
 procedure TCEMainForm.actEdFindExecute(Sender: TObject);
 var
   win: TAnchorDockHostSite;
-  ed: TCESynMemo;
   str: string;
 begin
   win := DockMaster.GetAnchorSite(fFindWidg);
@@ -1214,13 +1215,8 @@ begin
       dt^.project := fProject;
       dt^.position := getLineFromDmdMessage(msg);
       if openFileFromDmdMessage(msg) then
-        dt^.editor := fDoc
-      else
-        dt^.editor := nil;
-      if dt^.editor = nil then
-        dt^.editor := fDoc
-      else
         dt^.ctxt := mcEditor;
+      dt^.editor := fDoc;
       fEditWidg.endUpdatebyDelay; // messages would be cleared by the delayed module name detection.
       fMesgWidg.addMessage(msg, dt);
       application.ProcessMessages;
diff --git a/src/ce_messages.pas b/src/ce_messages.pas
index 9f050dac..dfaf4c6f 100644
--- a/src/ce_messages.pas
+++ b/src/ce_messages.pas
@@ -33,8 +33,8 @@ type
     fActSaveMsg: TAction;
     fActCopyMsg: TAction;
     fActSelAll: TAction;
-    fProj: TCEProject;
     fMaxMessCnt: Integer;
+    fProj: TCEProject;
     fDoc: TCESynMemo;
     procedure filterMessages;
     procedure clearOutOfRangeMessg;
@@ -53,6 +53,7 @@ type
     property maxMessageCount: Integer read fMaxMessCnt write setMaxMessageCount default 125;
   public
     constructor create(aOwner: TComponent); override;
+    destructor destroy; override;
     //
     procedure scrollToBack;
     procedure addMessage(const aMsg: string; aCtxt: TMessageContext = mcUnknown);
@@ -123,6 +124,12 @@ begin
   EntitiesConnector.addObserver(self);
 end;
 
+destructor TCEMessagesWidget.destroy;
+begin
+  EntitiesConnector.removeObserver(self);
+  Inherited;
+end;
+
 procedure TCEMessagesWidget.listDeletion(Sender: TObject; Node: TTreeNode);
 begin
   if node.Data <> nil then
@@ -299,6 +306,7 @@ end;
 
 procedure TCEMessagesWidget.docChanged(const aDoc: TCESynMemo);
 begin
+  fDoc := aDoc;
 end;
 {$ENDREGION}
 
@@ -561,7 +569,7 @@ begin
       ext := extractFileExt(ident);
       if not (ext = '.d') or (ext = '.di') then exit;
       CEMainForm.openFile(ident);
-      exit(true);
+      result := true;
     end;
     ident += aMessage[i];
   end;
diff --git a/src/ce_observer.pas b/src/ce_observer.pas
index b83689cd..3cc79928 100644
--- a/src/ce_observer.pas
+++ b/src/ce_observer.pas
@@ -132,7 +132,8 @@ begin
   fUpdating := true;
   fObservers.Remove(anObserver);
   for i := 0 to fSubjects.Count-1 do
-    (fSubjects[i] as ICESubject).removeObserver(anObserver);
+    if fSubjects[i] <> nil then
+      (fSubjects[i] as ICESubject).removeObserver(anObserver);
 end;
 
 procedure TCEEntitiesConnector.removeSubject(aSubject: TObject);
diff --git a/src/ce_projconf.pas b/src/ce_projconf.pas
index ec31c6b5..ca9b7237 100644
--- a/src/ce_projconf.pas
+++ b/src/ce_projconf.pas
@@ -35,6 +35,7 @@ type
     procedure UpdateByEvent; override;
   public
     constructor create(aOwner: TComponent); override;
+    destructor destroy; override;
     //
     procedure projNew(const aProject: TCEProject);
     procedure projClosing(const aProject: TCEProject);
@@ -54,6 +55,11 @@ begin
   EntitiesConnector.addObserver(self);
 end;
 
+destructor TCEProjectConfigurationWidget.destroy;
+begin
+  EntitiesConnector.removeObserver(self);
+  inherited;
+end;
 
 procedure TCEProjectConfigurationWidget.projNew(const aProject: TCEProject);
 begin
diff --git a/src/ce_projinspect.pas b/src/ce_projinspect.pas
index 114d7e37..cf15f348 100644
--- a/src/ce_projinspect.pas
+++ b/src/ce_projinspect.pas
@@ -38,6 +38,7 @@ type
     procedure actOpenFileExecute(sender: TObject);
   public
     constructor create(aOwner: TComponent); override;
+    destructor destroy; override;
     //
     procedure projNew(const aProject: TCEProject);
     procedure projClosing(const aProject: TCEProject);
@@ -75,6 +76,13 @@ begin
   //
   EntitiesConnector.addObserver(self);
 end;
+
+destructor TCEProjectInspectWidget.destroy;
+begin
+  EntitiesConnector.removeObserver(self);
+  inherited;
+end;
+
 {$ENDREGION}
 
 {$REGION ICEContextualActions---------------------------------------------------}
diff --git a/src/ce_search.pas b/src/ce_search.pas
index 150e76da..f6f38fad 100644
--- a/src/ce_search.pas
+++ b/src/ce_search.pas
@@ -97,6 +97,7 @@ end;
 
 destructor TCESearchWidget.Destroy;
 begin
+  EntitiesConnector.removeObserver(self);
   fSearchMru.Free;
   fReplaceMru.Free;
   inherited;
diff --git a/src/ce_staticexplorer.pas b/src/ce_staticexplorer.pas
index f28e04e4..082c8301 100644
--- a/src/ce_staticexplorer.pas
+++ b/src/ce_staticexplorer.pas
@@ -59,6 +59,7 @@ type
     property refreshOnFocus: boolean read fRefreshOnFocus write fRefreshOnFocus;
   public
     constructor create(aOwner: TComponent); override;
+    destructor destroy; override;
     //
     procedure docNew(const aDoc: TCESynMemo);
     procedure docClosing(const aDoc: TCESynMemo);
@@ -132,6 +133,13 @@ begin
   //
   EntitiesConnector.addObserver(self);
 end;
+
+destructor TCEStaticExplorerWidget.destroy;
+begin
+  EntitiesConnector.removeObserver(self);
+  inherited;
+end;
+
 {$ENDREGION}
 
 {$REGION ICEWidgetPersist ------------------------------------------------------}
@@ -225,6 +233,8 @@ end;
 {$REGION ICEMultiDocObserver ---------------------------------------------------}
 procedure TCEStaticExplorerWidget.docNew(const aDoc: TCESynMemo);
 begin
+  fDoc := aDoc;
+  beginUpdateByDelay;
 end;
 
 procedure TCEStaticExplorerWidget.docClosing(const aDoc: TCESynMemo);
diff --git a/src/ce_synmemo.pas b/src/ce_synmemo.pas
index cbda7672..9cb106c5 100644
--- a/src/ce_synmemo.pas
+++ b/src/ce_synmemo.pas
@@ -8,7 +8,7 @@ interface
 uses
   Classes, SysUtils, SynEdit, SynMemo, ce_d2syn, SynEditHighlighter, controls,
   lcltype, LazSynEditText, SynPluginSyncroEdit, SynEditKeyCmds, ce_project,
-  SynEditMouseCmds, ce_common, ce_observer;
+  SynHighlighterLFM, SynEditMouseCmds, ce_common, ce_observer;
 
 type
   TCESynMemo = class(TSynMemo)
@@ -53,11 +53,12 @@ type
 
 var
   D2Syn: TSynD2Syn;
+  LfmSyn: TSynLfmSyn;
 
 implementation
 
 uses
-  graphics, ce_main, ce_interfaces;
+  graphics, ce_interfaces;
 
 constructor TCESynMemo.Create(aOwner: TComponent);
 begin
@@ -83,14 +84,12 @@ begin
   Highlighter := D2Syn;
   D2Syn.FoldKinds := [fkBrackets, fkComments1, fkComments2, fkStrings];
   //
+  fTempFileName := GetTempDir(false) + 'temp_' + uniqueObjStr(self) + '.d';
   fFilename := '<new document>';
   fModified := false;
   ShowHint := true;
   TextBuffer.AddNotifyHandler(senrUndoRedoAdded, @changeNotify);
-
-  // avoid many call to get envir.string
-  fTempFileName := GetTempDir(false) + 'temp_' + uniqueObjStr(self) + '.d';
-
+  //
   fMultiDocSubject := TCEMultiDocSubject.create;
   subjDocNew(TCEMultiDocSubject(fMultiDocSubject), self);
 end;
@@ -132,7 +131,7 @@ procedure TCESynMemo.SetHighlighter(const Value: TSynCustomHighlighter);
 begin
   inherited;
   fIsDSource := Highlighter = D2Syn;
-  fIsConfig := Highlighter = CEMainForm.LfmSyn;
+  fIsConfig := Highlighter = LfmSyn;
 end;
 
 procedure TCESynMemo.identifierToD2Syn;
@@ -168,7 +167,8 @@ begin
   fFilename := aFilename;
   FileAge(fFilename, fFileDate);
   fModified := false;
-  subjDocChanged(TCEMultiDocSubject(fMultiDocSubject), self);
+  if fFilename <> fTempFileName then
+    subjDocChanged(TCEMultiDocSubject(fMultiDocSubject), self);
 end;
 
 procedure TCESynMemo.save;
@@ -176,7 +176,8 @@ begin
   Lines.SaveToFile(fFilename);
   FileAge(fFilename, fFileDate);
   fModified := false;
-  subjDocChanged(TCEMultiDocSubject(fMultiDocSubject), self);
+  if fFilename <> fTempFileName then
+    subjDocChanged(TCEMultiDocSubject(fMultiDocSubject), self);
 end;
 
 procedure TCESynMemo.checkFileDate;
@@ -219,6 +220,8 @@ end;
 
 initialization
   D2Syn := TSynD2Syn.create(nil);
+  LfmSyn := TSynLFMSyn.Create(nil);
 finalization
   D2Syn.free;
+  LfmSyn.Free;
 end.