diff --git a/common/version.h b/common/version.h
index adb0688a..86192915 100644
--- a/common/version.h
+++ b/common/version.h
@@ -2,8 +2,8 @@
 
 #define MIHAJONG_MAJOR_VER 2
 #define MIHAJONG_MINOR_VER 4
-#define MIHAJONG_PATCH_VER 3
-#define MIHAJONG_VER "2.4.3"
+#define MIHAJONG_PATCH_VER 4
+#define MIHAJONG_VER "2.4.4"
 
 #define MJCORE_MAJOR_VER 2
 #define MJCORE_MINOR_VER 4
@@ -32,8 +32,8 @@
 
 #define GRAPHIC_MAJOR_VER 2
 #define GRAPHIC_MINOR_VER 4
-#define GRAPHIC_PATCH_VER 2
-#define GRAPHIC_VER "2.4.2"
+#define GRAPHIC_PATCH_VER 4
+#define GRAPHIC_VER "2.4.4"
 
 #define CONFIG_MAJOR_VER 2
 #define CONFIG_MINOR_VER 4
diff --git a/graphic/init.cpp b/graphic/init.cpp
index c367ae2e..2fd1965a 100644
--- a/graphic/init.cpp
+++ b/graphic/init.cpp
@@ -23,6 +23,9 @@ namespace {
 	std::condition_variable condVar;
 	bool initialized = false;
 }
+#ifndef WITH_DIRECTX
+thread_local bool isGraphicThread = false;
+#endif
 
 #if defined(_WIN32) && !defined(WITH_DIRECTX)
 GdiplusStartupInput gdiplusInput;
@@ -37,6 +40,9 @@ EXPORT bool InitWindow(void* hInstance, int nCmdShow, LPCTSTR icon, Window* hwnd
 {
 	/* ウィンドウの初期化 */
 	std::unique_lock<std::mutex> lock(initMutex);
+#ifndef WITH_DIRECTX
+	isGraphicThread = true;
+#endif
 #if defined(_WIN32) && !defined(WITH_DIRECTX)
 	GdiplusStartup(&gdiplusToken, &gdiplusInput, nullptr);
 #endif
diff --git a/graphic/loadtex.cpp b/graphic/loadtex.cpp
index 02dd36b3..a0b78a47 100644
--- a/graphic/loadtex.cpp
+++ b/graphic/loadtex.cpp
@@ -22,8 +22,16 @@ namespace mihajong_graphic {
 	std::map<TexturePtr, unsigned> TextureHeight;
 #endif
 //}
+#ifndef WITH_DIRECTX
+extern thread_local bool isGraphicThread;
+#endif
 
 void LoadTexture(DevicePtr device, TexturePtr* texture, LPCTSTR resource) {
+#ifndef WITH_DIRECTX
+	if (!isGraphicThread) {
+		return; // OpenGLの場合は違うスレッドで読み込んでも意味がない
+	}
+#endif
 #if defined(_WIN32) && !defined(WITH_DIRECTX)
 	using namespace Gdiplus;
 #endif