diff --git a/lib/Slic3r/GUI/Plater/3DPreview.pm b/lib/Slic3r/GUI/Plater/3DPreview.pm
index f0175f5a4..6f96b8a96 100644
--- a/lib/Slic3r/GUI/Plater/3DPreview.pm
+++ b/lib/Slic3r/GUI/Plater/3DPreview.pm
@@ -72,6 +72,9 @@ sub new {
     
     my $combochecklist_features = Wx::ComboCtrl->new();
     $combochecklist_features->Create($self, -1, "Feature types", wxDefaultPosition, [200, -1], wxCB_READONLY);
+    #FIXME If the following line is removed, the combo box popup list will not react to mouse clicks.
+    # On the other side, with this line the combo box popup cannot be closed by clicking on the combo button on Windows 10.
+    $combochecklist_features->UseAltPopupWindow();
     $combochecklist_features->EnablePopupAnimation(0);
     my $feature_text = "Feature types";
     my $feature_items = "Perimeter|External perimeter|Overhang perimeter|Internal infill|Solid infill|Top solid infill|Bridge infill|Gap fill|Skirt|Support material|Support material interface|Wipe tower";
diff --git a/xs/src/slic3r/GUI/GUI.cpp b/xs/src/slic3r/GUI/GUI.cpp
index 775cfdcf6..809ee8508 100644
--- a/xs/src/slic3r/GUI/GUI.cpp
+++ b/xs/src/slic3r/GUI/GUI.cpp
@@ -227,7 +227,7 @@ int combochecklist_get_flags(wxComboCtrl* comboCtrl)
         for (unsigned int i = 0; i < popup->GetCount(); ++i)
         {
             if (popup->IsChecked(i))
-                flags += (int)std::pow(2.0f, (float)i);
+                flags |= 1 << i;
         }
     }