diff --git a/.github/workflows/qt5_6.yml b/.github/workflows/qt5_6.yml
index ac4bdca9..6b5759cf 100644
--- a/.github/workflows/qt5_6.yml
+++ b/.github/workflows/qt5_6.yml
@@ -163,19 +163,26 @@ jobs:
         uses: actions/cache@v4
         with:
           path: C:\Users\runneradmin\AppData\Local\Temp\chocolatey
-          key: ${{ runner.os }}${{ inputs.qt_version == '6' && '-chocolatey-qt6' || '-chocolatey' }}
+          key: ${{ runner.os }}${{ '-chocolatey' }}
 
-      - name: 📥 Install DirectX SDK, OpenSSL, libjpeg-turbo ${{ inputs.qt_version == '6' && 'and Vulkan-SDK' || '' }}
+      - name: 📥 Install DirectX SDK, OpenSSL, libjpeg-turbo
         shell: powershell
         run: |
-          choco install --no-progress directx-sdk ${{env.VULKAN_SDK}} -y
+          choco install --no-progress directx-sdk -y
           choco install --no-progress ${{env.OPENSSL}} -y
           Invoke-WebRequest https://netcologne.dl.sourceforge.net/project/libjpeg-turbo/3.0.1/libjpeg-turbo-3.0.1-vc64.exe -OutFile libjpeg-turbo.exe -UserAgent NativeHost
           .\libjpeg-turbo /S
         env:
-          VULKAN_SDK: ${{ inputs.qt_version == '6' && 'vulkan-sdk' || '' }}
           OPENSSL: ${{ inputs.qt_version == '6' && 'openssl' || 'openssl --version=1.1.1.2100' }}
 
+      - name: Install Vulkan SDK
+        if: ${{ inputs.qt_version == '6' }}
+        uses: jakoch/install-vulkan-sdk-action@v1.0.3
+        with:
+          install_runtime: false
+          cache: true
+          stripdown: true
+
       - name: 📥 Install Qt
         uses: jurplel/install-qt-action@v4
         with:
diff --git a/dependencies/external/flatbuffers b/dependencies/external/flatbuffers
index 0100f6a5..595bf000 160000
--- a/dependencies/external/flatbuffers
+++ b/dependencies/external/flatbuffers
@@ -1 +1 @@
-Subproject commit 0100f6a5779831fa7a651e4b67ef389a8752bd9b
+Subproject commit 595bf0007ab1929570c7671f091313c8fc20644e
diff --git a/dependencies/external/mbedtls b/dependencies/external/mbedtls
index edb8fec9..2ca6c285 160000
--- a/dependencies/external/mbedtls
+++ b/dependencies/external/mbedtls
@@ -1 +1 @@
-Subproject commit edb8fec9882084344a314368ac7fd957a187519c
+Subproject commit 2ca6c285a0dd3f33982dd57299012dacab1ff206
diff --git a/dependencies/external/protobuf b/dependencies/external/protobuf
index 7f94235e..3d9f7c43 160000
--- a/dependencies/external/protobuf
+++ b/dependencies/external/protobuf
@@ -1 +1 @@
-Subproject commit 7f94235e552599141950d7a4a3eaf93bc87d1b22
+Subproject commit 3d9f7c430a5ae1385512908801492d4421c3cdb7
diff --git a/include/grabber/video/mediafoundation/MFGrabber.h b/include/grabber/video/mediafoundation/MFGrabber.h
index 47c8cc62..da3b90c9 100644
--- a/include/grabber/video/mediafoundation/MFGrabber.h
+++ b/include/grabber/video/mediafoundation/MFGrabber.h
@@ -46,6 +46,7 @@ public:
 		int numerator	= 0;
 		int denominator = 0;
 		PixelFormat pf	= PixelFormat::NO_CHANGE;
+		long defstride  = 0;
 		GUID guid		= GUID_NULL;
 	};
 
diff --git a/include/utils/PixelFormat.h b/include/utils/PixelFormat.h
index 375ddc4e..10eb9a1e 100644
--- a/include/utils/PixelFormat.h
+++ b/include/utils/PixelFormat.h
@@ -124,10 +124,10 @@ inline QString pixelFormatToString(const PixelFormat& pixelFormat)
 
 enum class FlipMode
 {
+	NO_CHANGE,
 	HORIZONTAL,
 	VERTICAL,
-	BOTH,
-	NO_CHANGE
+	BOTH
 };
 
 inline FlipMode parseFlipMode(const QString& flipMode)
diff --git a/libsrc/grabber/dda/DDAGrabber.cpp b/libsrc/grabber/dda/DDAGrabber.cpp
index aea46046..6be4d40a 100644
--- a/libsrc/grabber/dda/DDAGrabber.cpp
+++ b/libsrc/grabber/dda/DDAGrabber.cpp
@@ -174,7 +174,7 @@ int DDAGrabber::grabFrame(Image<ColorRgb> &image)
 	// Acquire the next frame.
 	CComPtr<IDXGIResource> desktopResource;
 	DXGI_OUTDUPL_FRAME_INFO frameInfo;
-	hr = d->desktopDuplication->AcquireNextFrame(INFINITE, &frameInfo, &desktopResource);
+	hr = d->desktopDuplication->AcquireNextFrame(500, &frameInfo, &desktopResource);
 	if (hr == DXGI_ERROR_ACCESS_LOST || hr == DXGI_ERROR_INVALID_CALL)
 	{
 		if (!restartCapture())
@@ -185,7 +185,7 @@ int DDAGrabber::grabFrame(Image<ColorRgb> &image)
 	}
 	if (hr == DXGI_ERROR_WAIT_TIMEOUT)
 	{
-		// This shouldn't happen since we specified an INFINITE timeout.
+		// Nothing changed on the screen in the 500ms we waited.
 		return 0;
 	}
 	RETURN_IF_ERROR(hr, "Failed to acquire next frame", 0);
diff --git a/libsrc/grabber/video/mediafoundation/MFGrabber.cpp b/libsrc/grabber/video/mediafoundation/MFGrabber.cpp
index 1cacf4aa..178e248d 100644
--- a/libsrc/grabber/video/mediafoundation/MFGrabber.cpp
+++ b/libsrc/grabber/video/mediafoundation/MFGrabber.cpp
@@ -363,6 +363,18 @@ done:
 		_height = props.height;
 		_frameByteSize = _width * _height * 3;
 		_lineLength = _width * 3;
+		// adjust flipMode for bottom-up images
+		if (props.defstride < 0)
+		{
+			if (_flipMode == FlipMode::NO_CHANGE)
+				_flipMode = FlipMode::HORIZONTAL;
+			else if (_flipMode == FlipMode::HORIZONTAL)
+				_flipMode = FlipMode::NO_CHANGE;
+			else if (_flipMode == FlipMode::VERTICAL)
+				_flipMode = FlipMode::BOTH;
+			else if (_flipMode == FlipMode::BOTH)
+				_flipMode = FlipMode::VERTICAL;
+		}
 	}
 
 	// Cleanup
@@ -436,6 +448,14 @@ void MFGrabber::enumVideoCaptureDevices()
 												properties.denominator = denominator;
 												properties.pf = pixelformat;
 												properties.guid = format;
+
+												HRESULT hr = pType->GetUINT32(MF_MT_DEFAULT_STRIDE, (UINT32*)&properties.defstride);
+												if (FAILED(hr))
+												{
+													hr = MFGetStrideForBitmapInfoHeader(format.Data1, width, &properties.defstride);
+													if (FAILED(hr))
+														DebugIf (verbose, _log, "failed to get default stride");
+												}
 												devicePropertyList.append(properties);
 
 												DebugIf (verbose, _log, "%s %d x %d @ %d fps (%s)", QSTRING_CSTR(dev), properties.width, properties.height, properties.fps, QSTRING_CSTR(pixelFormatToString(properties.pf)));
@@ -797,7 +817,7 @@ QJsonArray MFGrabber::discover(const QJsonObject& params)
 		resolution_default["width"] = 640;
 		resolution_default["height"] = 480;
 		resolution_default["fps"] = 25;
-		format_default["format"] = "bgr24";
+		format_default["format"] = "rgb24";
 		format_default["resolution"] = resolution_default;
 		video_inputs_default["inputIdx"] = 0;
 		video_inputs_default["standards"] = "PAL";