diff --git a/ChangeLog b/ChangeLog
index f459b2f37c..a513eb108b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+Mon Feb  1 07:36:33 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
+
+	* ext/tk/tkutil/tkutil.c: fix SEGV on TkUtil::CallbackSubst._setup_subst_table.
+
+	* ext/tk/lib/tk.rb: [ruby1.9] fix freeze at exit.
+
+	* ext/tk/lib/tk.rb: [POTENTIAL INCOMPATIBLE] return NoMethodError
+	  for TkWindow#to_ary and to_str.
+
+	* ext/tk/lib/tkextlib/tcllib/plotchart.rb: wrong arguments.
+
+	* ext/tk/sampel/tkballoonhelp.rb: fail to support TkEntry widgets.
+
 Sun Jan 31 23:20:43 2010  wanabe  <s.wanabe@gmail.com>
 
 	* io.c (rb_io_each_codepoint): use cbuf when needs readconv.
diff --git a/ext/tk/lib/tk.rb b/ext/tk/lib/tk.rb
index 7552abed91..f17a6af4d2 100644
--- a/ext/tk/lib/tk.rb
+++ b/ext/tk/lib/tk.rb
@@ -1174,6 +1174,8 @@ module TkCore
       opts = ''
     end
 
+    # RUN_EVENTLOOP_ON_MAIN_THREAD = true
+
     unless self.const_defined? :RUN_EVENTLOOP_ON_MAIN_THREAD
       if WITH_RUBY_VM ### check Ruby 1.9 !!!!!!!
         # *** NEED TO FIX ***
@@ -1275,6 +1277,14 @@ module TkCore
 
       INTERP = INTERP_THREAD[:interp]
       INTERP_THREAD_STATUS = INTERP_THREAD[:status]
+
+      # delete the interpreter and kill the eventloop thread at exit
+      END{
+        if INTERP_THREAD.alive?
+          INTERP.delete
+          INTERP_THREAD.kill
+        end
+      }
     end
 
     def INTERP.__getip
@@ -4890,7 +4900,7 @@ class TkObject<TkKernel
       begin
         cget(name)
       rescue
-        if self.kind_of?(TkWindow)
+        if self.kind_of?(TkWindow) && name != "to_ary" && name != "to_str"
           fail NameError,
                "unknown option '#{id}' for #{self.inspect} (deleted widget?)"
         else
diff --git a/ext/tk/lib/tkextlib/tcllib/plotchart.rb b/ext/tk/lib/tkextlib/tcllib/plotchart.rb
index 6b7a526b75..3c944bb266 100644
--- a/ext/tk/lib/tkextlib/tcllib/plotchart.rb
+++ b/ext/tk/lib/tkextlib/tcllib/plotchart.rb
@@ -145,8 +145,8 @@ module Tk::Tcllib::Plotchart
     list(tk_call_without_enc('::Plotchart::coordsToPixel', w.path, x, y))
   end
 
-  def self.determine_scale(w, xmax, ymax)
-    tk_call_without_enc('::Plotchart::determineScale', w.path, xmax, ymax)
+  def self.determine_scale(*args) # (xmin, xmax, inverted=false)
+    tk_call_without_enc('::Plotchart::determineScale', *args)
   end
 
   def self.set_zoom_pan(w)
diff --git a/ext/tk/sample/tkballoonhelp.rb b/ext/tk/sample/tkballoonhelp.rb
index a9bd371db6..a9c00d230d 100644
--- a/ext/tk/sample/tkballoonhelp.rb
+++ b/ext/tk/sample/tkballoonhelp.rb
@@ -111,12 +111,24 @@ class Tk::RbWidget::BalloonHelp<TkLabel
     @frame.deiconify
     @frame.raise
 
-    @org_cursor = @parent['cursor']
-    @parent.cursor('crosshair')
+    begin
+      @org_cursor = @parent.cget('cursor')
+    rescue
+      @org_cursor = @parent['cursor']
+    end
+    begin
+      @parent.configure('cursor', 'crosshair')
+    rescue
+      @parent.cursor('crosshair')
+    end
   end
 
   def erase
-    @parent.cursor(@org_cursor)
+    begin
+      @parent.configure('cursor', @org_cursor)
+    rescue
+      @parent.cursor(@org_cursor)
+    end
     @frame.withdraw
   end
 
diff --git a/ext/tk/tkutil/tkutil.c b/ext/tk/tkutil/tkutil.c
index 6a670ce6fa..76cb5345be 100644
--- a/ext/tk/tkutil/tkutil.c
+++ b/ext/tk/tkutil/tkutil.c
@@ -1167,8 +1167,8 @@ subst_free(ptr)
     }
 }
 
-static struct cbsubst_info *
-allocate_cbsubst_info()
+static VALUE
+allocate_cbsubst_info(struct cbsubst_info **inf_ptr)
 {
   struct cbsubst_info *inf;
   volatile VALUE proc, aliases;
@@ -1191,15 +1191,16 @@ allocate_cbsubst_info()
   aliases = rb_hash_new();
   inf->aliases = aliases;
 
-  return inf;
+  if (inf_ptr != (struct cbsubst_info **)NULL) *inf_ptr = inf;
+
+  return Data_Wrap_Struct(cSUBST_INFO, subst_mark, subst_free, inf);
 }
 
 static void
 cbsubst_init()
 {
-    rb_const_set(cCB_SUBST, ID_SUBST_INFO, 
-		 Data_Wrap_Struct(cSUBST_INFO, subst_mark, subst_free, 
-				  allocate_cbsubst_info()));
+  rb_const_set(cCB_SUBST, ID_SUBST_INFO, 
+	       allocate_cbsubst_info((struct cbsubst_info **)NULL));
 }
 
 static VALUE
@@ -1517,6 +1518,7 @@ cbsubst_table_setup(argc, argv, self)
      VALUE *argv;
      VALUE self;
 {
+  volatile VALUE cbsubst_obj;
   volatile VALUE key_inf;
   volatile VALUE longkey_inf;
   volatile VALUE proc_inf;
@@ -1538,7 +1540,7 @@ cbsubst_table_setup(argc, argv, self)
   }
 
   /* init */
-  subst_inf = allocate_cbsubst_info();
+  cbsubst_obj = allocate_cbsubst_info(&subst_inf);
 
   /*
    * keys : array of [subst, type, ivar]
@@ -1625,9 +1627,7 @@ cbsubst_table_setup(argc, argv, self)
 		 RARRAY_PTR(inf)[1]);
   }
 
-  rb_const_set(self, ID_SUBST_INFO, 
-	       Data_Wrap_Struct(cSUBST_INFO, subst_mark, 
-				subst_free, subst_inf));
+  rb_const_set(self, ID_SUBST_INFO, cbsubst_obj);
 
   return self;
 }