diff --git a/source/bridges-ui/CarlaBridgeToolkitGtk.cpp b/source/bridges-ui/CarlaBridgeToolkitGtk.cpp
index 676771743..459f3dfea 100644
--- a/source/bridges-ui/CarlaBridgeToolkitGtk.cpp
+++ b/source/bridges-ui/CarlaBridgeToolkitGtk.cpp
@@ -85,7 +85,7 @@ public:
         gtk_container_add(GTK_CONTAINER(fWindow), widget);
 
         gtk_window_set_resizable(gtkWindow, options.isResizable);
-        gtk_window_set_title(gtkWindow, options.windowTitle);
+        gtk_window_set_title(gtkWindow, options.windowTitle.buffer());
 
         if (showUI || fNeedsShow)
         {
@@ -195,14 +195,10 @@ protected:
             gtk_window_get_size(GTK_WINDOW(fWindow), &fLastWidth, &fLastHeight);
         }
 
-        ui->idlePipe();
-        ui->idleUI();
+        if (ui->isPipeRunning())
+            ui->idlePipe();
 
-//         if (! fUi)
-//         {
-//             gtk_main_quit_if_needed();
-//             return false;
-//         }
+        ui->idleUI();
 
         return true;
     }
diff --git a/source/bridges-ui/CarlaBridgeToolkitPlugin.cpp b/source/bridges-ui/CarlaBridgeToolkitPlugin.cpp
index d02e4a896..ed47f5e58 100644
--- a/source/bridges-ui/CarlaBridgeToolkitPlugin.cpp
+++ b/source/bridges-ui/CarlaBridgeToolkitPlugin.cpp
@@ -65,7 +65,7 @@ public:
 #endif
         CARLA_SAFE_ASSERT_RETURN(fUI != nullptr, false);
 
-        fUI->setTitle(options.windowTitle);
+        fUI->setTitle(options.windowTitle.buffer());
         fUI->setTransientWinId(options.transientWindowId);
 
         return true;
@@ -90,12 +90,12 @@ public:
 
         for (; fIdling;)
         {
-            fUI->idle();
-            ui->idlePipe();
+            if (ui->isPipeRunning())
+                ui->idlePipe();
+
             ui->idleUI();
 
-            //if (! kClient->oscIdle())
-            //    break;
+            fUI->idle();
 
 #if defined(CARLA_OS_WIN) || defined(CARLA_OS_MAC)
             if (MessageManager* const msgMgr = MessageManager::getInstance())
@@ -108,13 +108,16 @@ public:
 
     void quit() override
     {
-        CARLA_SAFE_ASSERT_RETURN(fUI != nullptr,);
         carla_debug("CarlaBridgeToolkitPlugin::quit()");
 
         fIdling = false;
 
-        delete fUI;
-        fUI = nullptr;
+        if (fUI != nullptr)
+        {
+            fUI->hide();
+            delete fUI;
+            fUI = nullptr;
+        }
     }
 
     void show() override
diff --git a/source/bridges-ui/CarlaBridgeToolkitQt.cpp b/source/bridges-ui/CarlaBridgeToolkitQt.cpp
index 387894ada..7b8fb481f 100644
--- a/source/bridges-ui/CarlaBridgeToolkitQt.cpp
+++ b/source/bridges-ui/CarlaBridgeToolkitQt.cpp
@@ -112,7 +112,7 @@ public:
         }
 
         fWindow->setWindowIcon(QIcon::fromTheme("carla", QIcon(":/scalable/carla.svg")));
-        fWindow->setWindowTitle(options.windowTitle);
+        fWindow->setWindowTitle(options.windowTitle.buffer());
 
         if (options.transientWindowId != 0)
         {
@@ -226,15 +226,10 @@ protected:
     {
         CARLA_SAFE_ASSERT_RETURN(ui != nullptr,);
 
-        ui->idlePipe();
-        ui->idleUI();
+        if (ui->isPipeRunning())
+            ui->idlePipe();
 
-//         if (! kClient->oscIdle())
-//         {
-//             killTimer(fMsgTimer);
-//             fMsgTimer = 0;
-//             fApp->quit();
-//         }
+        ui->idleUI();
     }
 
 private:
diff --git a/source/bridges-ui/CarlaBridgeUI-LV2.cpp b/source/bridges-ui/CarlaBridgeUI-LV2.cpp
index 8d74b84fc..467c871fd 100644
--- a/source/bridges-ui/CarlaBridgeUI-LV2.cpp
+++ b/source/bridges-ui/CarlaBridgeUI-LV2.cpp
@@ -377,12 +377,6 @@ public:
 
     bool init(const int argc, const char* argv[]) override
     {
-        // -----------------------------------------------------------------
-        // init UI
-
-        if (! CarlaBridgeUI::init(argc, argv))
-            return false;
-
         const char* pluginURI = argv[1];
         const char* uiURI     = argv[2];
 
@@ -422,6 +416,45 @@ public:
 
         CARLA_SAFE_ASSERT_RETURN(fRdfUiDescriptor != nullptr, false);
 
+        // -----------------------------------------------------------
+        // check if not resizable
+
+#if defined(BRIDGE_COCOA) || defined(BRIDGE_HWND) || defined(BRIDGE_X11)
+        // embed UIs can only be resizable if they provide resize extension
+        fUiOptions.isResizable = false;
+
+        for (uint32_t i=0; i < fRdfUiDescriptor->ExtensionCount; ++i)
+        {
+            carla_stdout("Test UI extension %s", fRdfUiDescriptor->Extensions[i]);
+
+            if (std::strcmp(fRdfUiDescriptor->Extensions[i], LV2_UI__resize) == 0)
+            {
+                fUiOptions.isResizable = true;
+                break;
+            }
+        }
+#endif
+
+        for (uint32_t i=0; i < fRdfUiDescriptor->FeatureCount; ++i)
+        {
+            carla_stdout("Test UI feature %s", fRdfUiDescriptor->Features[i].URI);
+
+            if (std::strcmp(fRdfUiDescriptor->Features[i].URI, LV2_UI__fixedSize   ) == 0 ||
+                std::strcmp(fRdfUiDescriptor->Features[i].URI, LV2_UI__noUserResize) == 0)
+            {
+                fUiOptions.isResizable = false;
+                break;
+            }
+        }
+
+        carla_stdout("Is resizable => %s", bool2str(fUiOptions.isResizable));
+
+        // -----------------------------------------------------------------
+        // init UI
+
+        if (! CarlaBridgeUI::init(argc, argv))
+            return false;
+
         // -----------------------------------------------------------------
         // open DLL
 
@@ -465,19 +498,6 @@ public:
         fHandle = fDescriptor->instantiate(fDescriptor, fRdfDescriptor->URI, fRdfUiDescriptor->Bundle, carla_lv2_ui_write_function, this, &fWidget, fFeatures);
         CARLA_SAFE_ASSERT_RETURN(fHandle != nullptr, false);
 
-        // -----------------------------------------------------------
-        // check if not resizable
-
-        for (uint32_t j=0; j < fRdfUiDescriptor->FeatureCount; ++j)
-        {
-            if (std::strcmp(fRdfUiDescriptor->Features[j].URI, LV2_UI__fixedSize   ) == 0 ||
-                std::strcmp(fRdfUiDescriptor->Features[j].URI, LV2_UI__noUserResize) == 0)
-            {
-                fUiOptions.isResizable = false;
-                break;
-            }
-        }
-
         // -----------------------------------------------------------
         // check for known extensions
 
@@ -568,7 +588,7 @@ public:
 
     void dspAtomReceived(const uint32_t portIndex, const LV2_Atom* const atom) override
     {
-        CARLA_SAFE_ASSERT_RETURN(fHandle != nullptr,)
+        CARLA_SAFE_ASSERT_RETURN(fHandle != nullptr,);
         CARLA_SAFE_ASSERT_RETURN(fDescriptor != nullptr,);
         CARLA_SAFE_ASSERT_RETURN(atom != nullptr,);
 
diff --git a/source/bridges-ui/CarlaBridgeUI.cpp b/source/bridges-ui/CarlaBridgeUI.cpp
index bc28d10db..6dcf21315 100644
--- a/source/bridges-ui/CarlaBridgeUI.cpp
+++ b/source/bridges-ui/CarlaBridgeUI.cpp
@@ -245,6 +245,8 @@ bool CarlaBridgeUI::msgReceived(const char* const msg) noexcept
     {
         fQuitReceived = true;
         fToolkit->quit();
+        delete fToolkit;
+        fToolkit = nullptr;
         return true;
     }
 
@@ -300,6 +302,11 @@ bool CarlaBridgeUI::init(const int argc, const char* argv[])
         }
 #endif
     }
+    else
+    {
+        // no mapping needed
+        fUridMapComplete = true;
+    }
 
     return true;
 }
diff --git a/source/bridges-ui/CarlaBridgeUI.hpp b/source/bridges-ui/CarlaBridgeUI.hpp
index fde8e3bd9..ca5dcba04 100644
--- a/source/bridges-ui/CarlaBridgeUI.hpp
+++ b/source/bridges-ui/CarlaBridgeUI.hpp
@@ -21,6 +21,7 @@
 #include "CarlaBridgeToolkit.hpp"
 #include "CarlaLibUtils.hpp"
 #include "CarlaPipeUtils.hpp"
+#include "CarlaString.hpp"
 
 #ifdef BRIDGE_LV2
 # include "lv2/atom.h"
@@ -115,7 +116,7 @@ public:
         /*!
          * Window title.
          */
-        const char* windowTitle;
+        CarlaString windowTitle;
 
         /*!
          * Transient window id (parent), null if zero.
@@ -129,7 +130,7 @@ public:
             : isResizable(true),
               useTheme(true),
               useThemeColors(true),
-              windowTitle(nullptr),
+              windowTitle("TestUI"),
               transientWindowId(0) {}
     };