diff --git a/CMakeLists.txt b/CMakeLists.txt
index 90ebd1e5b..1e6cf45bd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,6 +34,8 @@ option(SLIC3R_PERL_XS           "Compile XS Perl module and enable Perl unit and
 option(SLIC3R_ASAN              "Enable ASan on Clang and GCC" 0)
 option(SLIC3R_SYNTAXONLY        "Only perform source code correctness checking, no binary output (UNIX only)" 0)
 
+set(SLIC3R_GTK "2" CACHE STRING "GTK version to use with wxWidgets on Linux")
+
 # Proposal for C++ unit tests and sandboxes
 option(SLIC3R_BUILD_SANDBOXES   "Build development sandboxes" OFF)
 option(SLIC3R_BUILD_TESTS       "Build unit tests" OFF)
diff --git a/doc/How to build - Windows.md b/doc/How to build - Windows.md
index 627f1c99b..020b28958 100644
--- a/doc/How to build - Windows.md	
+++ b/doc/How to build - Windows.md	
@@ -91,6 +91,10 @@ You can also use the Visual Studio GUI or other generators as mentioned above.
 The `DESTDIR` option is the location where the bundle will be installed.
 This may be customized. If you leave it empty, the `DESTDIR` will be places inside the same `build` directory.
 
+Warning: If the `build` directory is nested too deep inside other folders, various file paths during the build
+become too long and the build might fail due to file writing errors. For this reason, it is recommended to
+place the `build` directory relatively close to the drive root.
+
 Note that the build variant that you may choose using Visual Studio (i.e. _Release_ or _Debug_ etc.) when building the dependency package is **not relevant**.
 The dependency build will by default build _both_ the _Release_ and _Debug_ variants regardless of what you choose in Visual Studio.
 You can disable building of the debug variant by passing the `-DDEP_DEBUG=OFF` option to CMake, this will only produce a _Release_ build.
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index aae3436ae..a6ae94391 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -60,6 +60,7 @@ if (SLIC3R_GUI)
     endif()
 
     if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
+        set (wxWidgets_CONFIG_OPTIONS "--toolkit=gtk${SLIC3R_GTK}")
         if (SLIC3R_WX_STABLE)
             find_package(wxWidgets 3.0 REQUIRED COMPONENTS base core adv html gl)
         else ()
diff --git a/src/libslic3r/Format/AMF.cpp b/src/libslic3r/Format/AMF.cpp
index f5219263d..ff1da37cc 100644
--- a/src/libslic3r/Format/AMF.cpp
+++ b/src/libslic3r/Format/AMF.cpp
@@ -175,6 +175,11 @@ struct AMFParserContext
         bool  mirrory_set;
         float mirrorz;
         bool  mirrorz_set;
+
+        bool anything_set() const { return deltax_set || deltay_set || deltaz_set ||
+                                           rx_set || ry_set || rz_set ||
+                                           scalex_set || scaley_set || scalez_set ||
+                                           mirrorx_set || mirrory_set || mirrorz_set; }
     };
 
     struct Object {
@@ -644,11 +649,7 @@ void AMFParserContext::endDocument()
             continue;
         }
         for (const Instance &instance : object.second.instances)
-#if ENABLE_VOLUMES_CENTERING_FIXES
-        {
-#else
-            if (instance.deltax_set && instance.deltay_set) {
-#endif // ENABLE_VOLUMES_CENTERING_FIXES
+            if (instance.anything_set()) {
                 ModelInstance *mi = m_model.objects[object.second.idx]->add_instance();
                 mi->set_offset(Vec3d(instance.deltax_set ? (double)instance.deltax : 0.0, instance.deltay_set ? (double)instance.deltay : 0.0, instance.deltaz_set ? (double)instance.deltaz : 0.0));
                 mi->set_rotation(Vec3d(instance.rx_set ? (double)instance.rx : 0.0, instance.ry_set ? (double)instance.ry : 0.0, instance.rz_set ? (double)instance.rz : 0.0));
diff --git a/src/slic3r/GUI/GLToolbar.cpp b/src/slic3r/GUI/GLToolbar.cpp
index ac79784ad..2f7f13f6f 100644
--- a/src/slic3r/GUI/GLToolbar.cpp
+++ b/src/slic3r/GUI/GLToolbar.cpp
@@ -157,7 +157,6 @@ GLToolbar::GLToolbar(GLToolbar::EType type)
 #if ENABLE_SVG_ICONS
     , m_icons_texture_dirty(true)
 #endif // ENABLE_SVG_ICONS
-    , m_mouse_capture({ false, false, false, nullptr })
     , m_tooltip("")
 {
 }
@@ -410,6 +409,16 @@ bool GLToolbar::on_mouse(wxMouseEvent& evt, GLCanvas3D& parent)
     bool processed = false;
 
     // mouse anywhere
+    if (!evt.Dragging() && !evt.Leaving() && !evt.Entering() && (m_mouse_capture.parent != nullptr))
+    {
+        if (m_mouse_capture.any() && (evt.LeftUp() || evt.MiddleUp() || evt.RightUp()))
+            // prevents loosing selection into the scene if mouse down was done inside the toolbar and mouse up was down outside it,
+            // as when switching between views
+            processed = true;
+
+        m_mouse_capture.reset();
+    }
+
     if (evt.Moving())
         m_tooltip = update_hover_state(mouse_pos, parent);
     else if (evt.LeftUp())
@@ -418,17 +427,9 @@ bool GLToolbar::on_mouse(wxMouseEvent& evt, GLCanvas3D& parent)
         m_mouse_capture.middle = false;
     else if (evt.RightUp())
         m_mouse_capture.right = false;
-    else if (m_mouse_capture.any())
-    {
-        if (evt.Dragging())
-            processed = true;
-        else if (evt.Entering() && (m_mouse_capture.parent == &parent))
-            // Resets the mouse capture state to avoid setting the dragging event as processed when, for example,
-            // the item action opens a modal dialog
-            // Keeps the mouse capture state if the entering event happens on different parent from the one
-            // who received the button down event, to prevent, for example, dragging when switching between scene views 
-            m_mouse_capture.reset();
-    }
+    else if (evt.Dragging() && m_mouse_capture.any())
+        // if the button down was done on this toolbar, prevent from dragging into the scene
+        processed = true;
 
     int item_id = contains_mouse(mouse_pos, parent);
     if (item_id == -1)
diff --git a/src/slic3r/GUI/GLToolbar.hpp b/src/slic3r/GUI/GLToolbar.hpp
index 95953795f..5fac1f5b2 100644
--- a/src/slic3r/GUI/GLToolbar.hpp
+++ b/src/slic3r/GUI/GLToolbar.hpp
@@ -238,6 +238,8 @@ private:
         bool right;
         GLCanvas3D* parent;
 
+        MouseCapture() { reset(); }
+
         bool any() const { return left || middle || right; }
         void reset() { left = middle = right = false; parent = nullptr; }
     };
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index f9c598ce3..e15882125 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -1713,8 +1713,8 @@ std::vector<size_t> Plater::priv::load_model_objects(const ModelObjectPtrs &mode
             object->center_around_origin();
             new_instances.emplace_back(object->add_instance());
 #else /* AUTOPLACEMENT_ON_LOAD */
-            // if object has no defined position(s) we need to rearrange everything after loading               object->center_around_origin();
-            need_arrange = true;                
+            // if object has no defined position(s) we need to rearrange everything after loading
+            need_arrange = true;
              // add a default instance and center object around origin  
             object->center_around_origin();  // also aligns object to Z = 0 
             ModelInstance* instance = object->add_instance();