diff --git a/src/calibre/gui2/search_box.py b/src/calibre/gui2/search_box.py
index 5a4c34a5cd..5b8501ebb5 100644
--- a/src/calibre/gui2/search_box.py
+++ b/src/calibre/gui2/search_box.py
@@ -436,17 +436,18 @@ class SavedSearchBoxMixin(object): # {{{
             b = getattr(self, x+'_search_button')
             b.setStatusTip(b.toolTip())
 
-    def saved_searches_changed(self):
+    def saved_searches_changed(self, set_restriction=None):
         p = sorted(saved_searches().names(), key=sort_key)
-        t = unicode(self.search_restriction.currentText())
+        if set_restriction is None:
+            set_restriction = unicode(self.search_restriction.currentText())
         # rebuild the restrictions combobox using current saved searches
         self.search_restriction.clear()
         self.search_restriction.addItem('')
         self.tags_view.recount()
         for s in p:
             self.search_restriction.addItem(s)
-        if t: # redo the search restriction if there was one
-            self.apply_named_search_restriction(t)
+        if set_restriction: # redo the search restriction if there was one
+            self.apply_named_search_restriction(set_restriction)
 
     def do_saved_search_edit(self, search):
         d = SavedSearchEditor(self, search)
diff --git a/src/calibre/library/caches.py b/src/calibre/library/caches.py
index 6a3f591450..943e414c1a 100644
--- a/src/calibre/library/caches.py
+++ b/src/calibre/library/caches.py
@@ -6,7 +6,7 @@ __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 
-import re, itertools, time, traceback
+import re, itertools, time, traceback, copy
 from itertools import repeat, izip
 from datetime import timedelta
 from threading import Thread
@@ -788,10 +788,9 @@ class ResultCache(SearchQueryParser): # {{{
         '''
         if not hasattr(id_dict, 'items'):
             # Simple list. Make it a dict of string 'true'
-            self.marked_ids_dict = dict(izip(id_dict, repeat(u'true',
-                len(id_dict))))
+            self.marked_ids_dict = dict(izip(id_dict, repeat(u'true')))
         else:
-            self.marked_ids_dict = dict(**id_dict)
+            self.marked_ids_dict = copy.copy(id_dict)
             # Ensure that all the items in the dict are text
             for id_,val in self.marked_ids_dict.iteritems():
                 self.marked_ids_dict[id_] = unicode(val)