diff --git a/CHANGELOG.md b/CHANGELOG.md
index 72c44cf..23ecd76 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,8 @@
 - Strip `reasoning_content` from proxy output — Codex doesn't use it, avoids token waste
 - Force `max_tokens=64000` minimum for openai-compat providers — room for both reasoning and content
 - Inspired by unsloth's reasoning control patterns for Qwen/GPT-OSS models
+- Styled reasoning switch: green = ON, orange = OFF, gentle rounded pill shape
+- Added error handling to endpoint manager Add/Edit/Manage dialogs (prevents silent failures)
 
 ## v2.1.3 (2026-05-19)
 
diff --git a/codex-launcher_2.2.0_all.deb b/codex-launcher_2.2.0_all.deb
index c3e9789..1a10bc3 100644
Binary files a/codex-launcher_2.2.0_all.deb and b/codex-launcher_2.2.0_all.deb differ
diff --git a/src/codex-launcher-gui b/src/codex-launcher-gui
index 0fdaa07..c59ee71 100755
--- a/src/codex-launcher-gui
+++ b/src/codex-launcher-gui
@@ -810,8 +810,13 @@ class LauncherWin(Gtk.Window):
     # ── endpoint mgr ─────────────────────────────────────────────
 
     def _open_mgr(self):
-        self._mgr_window = EndpointMgr(self)
-        self._mgr_window.connect("destroy", lambda *_: setattr(self, "_mgr_window", None))
+        try:
+            self._mgr_window = EndpointMgr(self)
+            self._mgr_window.connect("destroy", lambda *_: setattr(self, "_mgr_window", None))
+        except Exception as e:
+            import traceback; traceback.print_exc()
+            d = Gtk.MessageDialog(self, 0, Gtk.MessageType.ERROR, Gtk.ButtonsType.OK, f"Error: {e}")
+            d.run(); d.destroy()
 
     def _backup_profile(self):
         chooser = Gtk.FileChooserDialog(
@@ -1328,14 +1333,24 @@ class EndpointMgr(Gtk.Window):
         return self._store[i][0]
 
     def _add(self):
-        self._dialog = EditEndpointDialog(self, None)
-        self._dialog.connect("destroy", lambda *_: setattr(self, "_dialog", None))
+        try:
+            self._dialog = EditEndpointDialog(self, None)
+            self._dialog.connect("destroy", lambda *_: setattr(self, "_dialog", None))
+        except Exception as e:
+            import traceback; traceback.print_exc()
+            d = Gtk.MessageDialog(self, 0, Gtk.MessageType.ERROR, Gtk.ButtonsType.OK, f"Error: {e}")
+            d.run(); d.destroy()
 
     def _edit(self):
         name = self._selected()
         if name:
-            self._dialog = EditEndpointDialog(self, name)
-            self._dialog.connect("destroy", lambda *_: setattr(self, "_dialog", None))
+            try:
+                self._dialog = EditEndpointDialog(self, name)
+                self._dialog.connect("destroy", lambda *_: setattr(self, "_dialog", None))
+            except Exception as e:
+                import traceback; traceback.print_exc()
+                d = Gtk.MessageDialog(self, 0, Gtk.MessageType.ERROR, Gtk.ButtonsType.OK, f"Error: {e}")
+                d.run(); d.destroy()
 
     def _delete(self):
         name = self._selected()
@@ -1430,13 +1445,12 @@ class EditEndpointDialog(Gtk.Dialog):
         self._entry_cc_ver.set_placeholder_text("e.g. 0.26.8 (Command Code only)")
         add_row(5, "CC Version:", self._entry_cc_ver)
 
-        reasoning_css = """
+        reasoning_css = b"""
         switch.reasoning-toggle {
             min-width: 56px; min-height: 28px;
             border-radius: 14px;
             background: #e67e22;
             border: 2px solid #cf6d17;
-            padding: 0;
         }
         switch.reasoning-toggle:checked {
             background: #2ecc71;
@@ -1447,18 +1461,19 @@ class EditEndpointDialog(Gtk.Dialog):
             border-radius: 12px;
             background: white;
             border: 1px solid #bbb;
-            box-shadow: 0 1px 3px rgba(0,0,0,0.2);
         }
         """
-        css_provider = Gtk.CssProvider()
-        css_provider.load_from_data(reasoning_css.encode())
-        reasoning_style = Gtk.StyleContext()
-        reasoning_style.add_provider(css_provider, Gtk.STYLE_PROVIDER_PRIORITY_USER)
-
         reasoning_box = Gtk.Box(spacing=10)
         self._switch_reasoning = Gtk.Switch()
         self._switch_reasoning.set_name("reasoning-toggle")
-        reasoning_style.add_class(self._switch_reasoning.get_style_context(), "reasoning-toggle")
+        ctx = self._switch_reasoning.get_style_context()
+        ctx.add_class("reasoning-toggle")
+        try:
+            css_prov = Gtk.CssProvider()
+            css_prov.load_from_data(reasoning_css)
+            ctx.add_provider(css_prov, Gtk.STYLE_PROVIDER_PRIORITY_USER)
+        except Exception:
+            pass
         self._switch_reasoning.set_active(self._data.get("reasoning_enabled", True))
         self._switch_reasoning.connect("notify::active", lambda *a: self._on_reasoning_toggled())
         reasoning_box.pack_start(self._switch_reasoning, False, False, 0)