diff --git a/dgl/src/Window.cpp b/dgl/src/Window.cpp
index 146fffc7..d67ab2b4 100644
--- a/dgl/src/Window.cpp
+++ b/dgl/src/Window.cpp
@@ -201,8 +201,14 @@ void Window::setSize(uint width, uint height)
     if (pData->isEmbed)
     {
         const double scaleFactor = pData->scaleFactor;
-        const uint minWidth = static_cast<uint>(pData->minWidth * scaleFactor + 0.5);
-        const uint minHeight = static_cast<uint>(pData->minHeight * scaleFactor + 0.5);
+        uint minWidth = pData->minWidth;
+        uint minHeight = pData->minHeight;
+
+        if (pData->autoScaling && scaleFactor != 1.0)
+        {
+            minWidth *= scaleFactor;
+            minHeight *= scaleFactor;
+        }
 
         // handle geometry constraints here
         if (width < minWidth)
diff --git a/distrho/src/DistrhoUI.cpp b/distrho/src/DistrhoUI.cpp
index 7f26308c..7366be34 100644
--- a/distrho/src/DistrhoUI.cpp
+++ b/distrho/src/DistrhoUI.cpp
@@ -199,7 +199,7 @@ UI::UI(const uint width, const uint height, const bool automaticallyScaleAndSetA
         Widget::setSize(width, height);
 
         if (automaticallyScaleAndSetAsMinimumSize)
-            setGeometryConstraints(width, height, true, true);
+            setGeometryConstraints(width, height, true, true, true);
     }
 #else
     // unused
@@ -383,7 +383,16 @@ void UI::onResize(const ResizeEvent& ev)
 // NOTE: only used for VST3
 void UI::requestSizeChange(const uint width, const uint height)
 {
-    uiData->setSizeCallback(width, height);
+# ifdef DISTRHO_PLUGIN_TARGET_VST3
+    if (uiData->initializing)
+        uiData->window->setSizeForVST3(width, height);
+    else
+        uiData->setSizeCallback(width, height);
+# else
+    // unused
+    (void)width;
+    (void)height;
+# endif
 }
 #endif
 
diff --git a/distrho/src/DistrhoUIVST3.cpp b/distrho/src/DistrhoUIVST3.cpp
index b6c97a01..00df1209 100644
--- a/distrho/src/DistrhoUIVST3.cpp
+++ b/distrho/src/DistrhoUIVST3.cpp
@@ -257,6 +257,7 @@ public:
         rect->right /= scaleFactor;
         rect->bottom /= scaleFactor;
 #endif
+        d_stdout("getSize request returning %i %i", rect->right, rect->bottom);
         return V3_OK;
     }
 
@@ -300,6 +301,11 @@ public:
         uint minimumWidth, minimumHeight;
         bool keepAspectRatio;
         fUI.getGeometryConstraints(minimumWidth, minimumHeight, keepAspectRatio);
+#ifdef DISTRHO_OS_MAC
+        const double scaleFactor = fUI.getScaleFactor();
+        minimumWidth /= scaleFactor;
+        minimumHeight /= scaleFactor;
+#endif
         applyGeometryConstraints(minimumWidth, minimumHeight, keepAspectRatio, rect);
         return V3_TRUE;
     }
@@ -1298,7 +1304,7 @@ struct dpf_plugin_view : v3_plugin_view_cpp {
 #endif
         rect->right = view->nextWidth;
         rect->bottom = view->nextHeight;
-        tmpUI.quit();
+        d_stdout("dpf_plugin_view::get_size => %p | next size %u %u with scale factor %f", self, view->nextWidth, view->nextHeight, lastScaleFactor);
         return V3_OK;
     }
 
@@ -1377,7 +1383,11 @@ struct dpf_plugin_view : v3_plugin_view_cpp {
         uint minimumWidth, minimumHeight;
         bool keepAspectRatio;
         tmpUI.getGeometryConstraints(minimumWidth, minimumHeight, keepAspectRatio);
-        tmpUI.quit();
+#ifdef DISTRHO_OS_MAC
+        const double scaleFactor = tmpUI.getScaleFactor();
+        minimumWidth /= scaleFactor;
+        minimumHeight /= scaleFactor;
+#endif
         applyGeometryConstraints(minimumWidth, minimumHeight, keepAspectRatio, rect);
         return V3_TRUE;
     }