diff --git a/include/nana/config.hpp b/include/nana/config.hpp
index 3b0a85dd..3136f531 100644
--- a/include/nana/config.hpp
+++ b/include/nana/config.hpp
@@ -106,6 +106,12 @@
 	#if defined(__GLIBCPP__) || defined(__GLIBCXX__)
 		//<codecvt> is a known issue on libstdc++, it works on libc++
 		#define STD_CODECVT_NOT_SUPPORTED
+
+
+		#ifndef STD_MAKE_UNIQUE_NOT_SUPPORTED
+			#define STD_MAKE_UNIQUE_NOT_SUPPORTED
+		#endif
+
 	#endif
 
 #elif defined(__GNUC__) //GCC
diff --git a/include/nana/filesystem/filesystem.hpp b/include/nana/filesystem/filesystem.hpp
index c60976dc..4f4423a1 100644
--- a/include/nana/filesystem/filesystem.hpp
+++ b/include/nana/filesystem/filesystem.hpp
@@ -364,6 +364,8 @@ namespace filesystem
 
 }//end namespace filesystem
 } //end namespace experimental
+
+	namespace filesystem = experimental::filesystem;
 }//end namespace nana
 
 #endif
diff --git a/source/gui/filebox.cpp b/source/gui/filebox.cpp
index 60303d62..a0985165 100644
--- a/source/gui/filebox.cpp
+++ b/source/gui/filebox.cpp
@@ -142,7 +142,7 @@ namespace nana
 				auto path = path_.caption();
 				auto root = path.substr(0, path.find('/'));
 				if(root == "HOME")
-					path.replace(0, 4, to_nstring(nana::filesystem::path_user()));
+					path.replace(0, 4, nana::filesystem::path_user().native());
 				else if(root == "FILESYSTEM")
 					path.erase(0, 10);
 				else
@@ -344,9 +344,9 @@ namespace nana
 			else
 				dir = saved_selected_path;
 
-			_m_load_cat_path(dir.size() ? dir : to_nstring(nana::filesystem::path_user()));
+			_m_load_cat_path(dir.size() ? dir : nana::filesystem::path_user().native());
 
-			tb_file_.caption(file_with_path_removed);					
+			tb_file_.caption(file_with_path_removed);
 		}
 		
 		void add_filter(const std::string& desc, const std::string& type)
@@ -430,7 +430,7 @@ namespace nana
 			namespace fs = ::nana::experimental::filesystem;
 
 			std::vector<std::string> paths;
-			paths.emplace_back(nana::filesystem::path_user());
+			paths.emplace_back(fs::path_user().native());
 			paths.emplace_back("/");
 
 			fs::directory_iterator end;
@@ -474,7 +474,7 @@ namespace nana
 			{
 				auto begstr = path.substr(0, pos);
 				if(begstr == "FS.HOME")
-					path.replace(0, 7, to_nstring(nana::filesystem::path_user()));
+					path.replace(0, 7, nana::filesystem::path_user().native());
 				else
 					path.erase(0, pos);
 				return begstr;
@@ -534,7 +534,7 @@ namespace nana
 			while(!beg_node.empty() && (beg_node != nodes_.home) && (beg_node != nodes_.filesystem))
 				beg_node = beg_node.owner();
 			
-			auto head = to_nstring(nana::filesystem::path_user());
+			auto head = nana::filesystem::path_user().native();
 			if(path.size() >= head.size() && (path.substr(0, head.size()) == head))
 			{//This is HOME
 				path_.caption("HOME");
diff --git a/source/gui/widgets/checkbox.cpp b/source/gui/widgets/checkbox.cpp
index 104c54a0..e0e0aa75 100644
--- a/source/gui/widgets/checkbox.cpp
+++ b/source/gui/widgets/checkbox.cpp
@@ -263,7 +263,7 @@ namespace checkbox
 				if (ui_container_.end() == i)
 					return;
 
-				checkbox * target;
+				checkbox * target = nullptr;
 
 				if (keyboard::os_arrow_up == arg.key)
 				{
@@ -280,8 +280,11 @@ namespace checkbox
 						target = ui_container_.front().uiobj;
 				}
 
-				target->check(true);
-				target->focus();
+				if(target)
+				{
+					target->check(true);
+					target->focus();
+				}
 			});
 			
 
diff --git a/source/paint/image.cpp b/source/paint/image.cpp
index 7902b864..d037d4b8 100644
--- a/source/paint/image.cpp
+++ b/source/paint/image.cpp
@@ -237,7 +237,7 @@ namespace paint
 #if defined(NANA_WINDOWS)
 					ptr = std::make_shared<detail::image_ico>(true);
 #else
-					return false;
+					return ptr;
 #endif
 					break;
 				}
@@ -247,7 +247,7 @@ namespace paint
 #if defined(NANA_ENABLE_PNG)
 					ptr = std::make_shared<detail::image_png>;
 #else
-					return false;
+					return ptr;
 #endif
 					break;
 				}
@@ -257,7 +257,7 @@ namespace paint
 #if defined(NANA_ENABLE_JPEG)
 					ptr = std::make_shared<detail::image_jpeg>();
 #else
-					return false;
+					return ptr;
 #endif
 					break;
 				}