diff --git a/app/connections.py b/app/connections.py
index 13445d32..cad6ba94 100644
--- a/app/connections.py
+++ b/app/connections.py
@@ -289,8 +289,9 @@ class HttpAPI:
 
     def __init__(self, settings):
         self._settings = settings
-        self._base_url = None
+        self._shutdown = False
         self._session_id = 0
+        self._base_url = None
         self._data = None
         self.init()
 
@@ -298,6 +299,9 @@ class HttpAPI:
         self._executor = PoolExecutor(max_workers=self.__MAX_WORKERS)
 
     def send(self, req_type, ref, callback=print):
+        if self._shutdown:
+            return
+
         url = self._base_url + req_type.value
 
         if req_type is HttpRequestType.ZAP or req_type is HttpRequestType.STREAM:
@@ -320,8 +324,10 @@ class HttpAPI:
         if s_id != "0":
             self._data = urllib.parse.urlencode({"user": user, "password": password, "sessionid": s_id}).encode("utf-8")
 
+    @run_task
     def close(self):
-        self._executor.shutdown(False)
+        self._shutdown = True
+        self._executor.shutdown()
 
 
 def get_response(req_type, url, data=None):
diff --git a/app/ui/main_app_window.py b/app/ui/main_app_window.py
index b7721cb3..cf10898c 100644
--- a/app/ui/main_app_window.py
+++ b/app/ui/main_app_window.py
@@ -1677,9 +1677,9 @@ class Application(Gtk.Application):
     def on_player_duration_changed(self, duration):
         self._player_scale.set_value(0)
         self._player_scale.get_adjustment().set_upper(duration)
-        GLib.idle_add(self._player_rewind_box.set_visible, duration > 0)
-        GLib.idle_add(self._player_current_time_label.set_text, "0")
-        GLib.idle_add(self._player_full_time_label.set_text, self.get_time_str(duration))
+        GLib.idle_add(self._player_rewind_box.set_visible, duration > 0, priority=GLib.PRIORITY_LOW)
+        GLib.idle_add(self._player_current_time_label.set_text, "0", priority=GLib.PRIORITY_LOW)
+        GLib.idle_add(self._player_full_time_label.set_text, self.get_time_str(duration), priority=GLib.PRIORITY_LOW)
 
     def on_player_time_changed(self, t):
         if not self._full_screen and self._player_rewind_box.get_visible():
diff --git a/app/ui/main_window.glade b/app/ui/main_window.glade
index 0e3e2bb7..89ef7033 100644
--- a/app/ui/main_window.glade
+++ b/app/ui/main_window.glade
@@ -1455,7 +1455,7 @@ Author: Dmitriy Yefremov
                             <child>
                               <object class="GtkScale" id="player_scale">
                                 <property name="visible">True</property>
-                                <property name="can_focus">True</property>
+                                <property name="can_focus">False</property>
                                 <property name="margin_left">5</property>
                                 <property name="margin_right">5</property>
                                 <property name="adjustment">player_scale_adjustment</property>
diff --git a/app/ui/service_details_dialog.py b/app/ui/service_details_dialog.py
index 3b2a8df5..59ebaedb 100644
--- a/app/ui/service_details_dialog.py
+++ b/app/ui/service_details_dialog.py
@@ -69,7 +69,7 @@ class ServiceDetailsDialog:
         # Patterns
         self._DIGIT_PATTERN = re.compile("\\D")
         self._NON_EMPTY_PATTERN = re.compile("(?:^[\\s]*$|\\D)")
-        self._CAID_PATTERN = re.compile("(?:^[\\s]*$)|(C:[0-9a-z]{4})(,C:[0-9a-z]{4})*")
+        self._CAID_PATTERN = re.compile("(?:^[\\s]*$)|(C:[0-9a-fA-F]{1,4})(,C:[0-9a-fA-F]{1,4})*")
         # Buttons
         self._apply_button = builder.get_object("apply_button")
         self._create_button = builder.get_object("create_button")