diff --git a/ISLE/emscripten/libwasmfs_fetch.js.patch b/ISLE/emscripten/emscripten.patch
similarity index 88%
rename from ISLE/emscripten/libwasmfs_fetch.js.patch
rename to ISLE/emscripten/emscripten.patch
index de8fab60..899d72eb 100644
--- a/ISLE/emscripten/libwasmfs_fetch.js.patch
+++ b/ISLE/emscripten/emscripten.patch
@@ -1,3 +1,16 @@
+diff --git a/src/lib/libpthread.js b/src/lib/libpthread.js
+index 6d979627e..97e3f8684 100644
+--- a/src/lib/libpthread.js
++++ b/src/lib/libpthread.js
+@@ -697,7 +697,7 @@ var LibraryPThread = {
+     {
+       transferredCanvasNames = UTF8ToString(transferredCanvasNames).trim();
+     }
+-    transferredCanvasNames = transferredCanvasNames ? transferredCanvasNames.split(',') : [];
++    transferredCanvasNames = transferredCanvasNames && !Module['disableOffscreenCanvases'] ? transferredCanvasNames.split(',') : [];
+ #if GL_DEBUG
+     dbg(`pthread_create: transferredCanvasNames="${transferredCanvasNames}"`);
+ #endif
 diff --git a/src/lib/libwasmfs_fetch.js b/src/lib/libwasmfs_fetch.js
 index e8c9f7e21..caf1971d2 100644
 --- a/src/lib/libwasmfs_fetch.js
diff --git a/LEGO1/lego/legoomni/src/common/mxtransitionmanager.cpp b/LEGO1/lego/legoomni/src/common/mxtransitionmanager.cpp
index d54563ab..9e052430 100644
--- a/LEGO1/lego/legoomni/src/common/mxtransitionmanager.cpp
+++ b/LEGO1/lego/legoomni/src/common/mxtransitionmanager.cpp
@@ -248,7 +248,7 @@ void MxTransitionManager::DissolveTransition()
 				}
 				else {
 					MxU8* surf = (MxU8*) ddsd.lpSurface + ddsd.lPitch * row + xShift * 4;
-					*(MxU32*) surf = 0;
+					*(MxU32*) surf = 0xFF000000;
 				}
 			}
 		}
@@ -416,10 +416,25 @@ void MxTransitionManager::WipeDownTransition()
 		// For each of the 240 animation ticks, blank out two scanlines
 		// starting at the top of the screen.
 		MxU8* line = (MxU8*) ddsd.lpSurface + 2 * ddsd.lPitch * m_animationTimer;
-		memset(line, 0, ddsd.lPitch);
 
-		line += ddsd.lPitch;
-		memset(line, 0, ddsd.lPitch);
+		if (ddsd.ddpfPixelFormat.dwRGBBitCount == 32) {
+			MxU32* pixels = (MxU32*) line;
+			int pixelsPerLine = ddsd.lPitch / 4;
+			for (int i = 0; i < pixelsPerLine; i++) {
+				pixels[i] = 0xFF000000;
+			}
+			line += ddsd.lPitch;
+			pixels = (MxU32*) line;
+			for (int i = 0; i < pixelsPerLine; i++) {
+				pixels[i] = 0xFF000000;
+			}
+		}
+		else {
+			memset(line, 0, ddsd.lPitch);
+
+			line += ddsd.lPitch;
+			memset(line, 0, ddsd.lPitch);
+		}
 
 		SetupCopyRect(&ddsd);
 		m_ddSurface->Unlock(ddsd.lpSurface);
diff --git a/docker/emscripten/Dockerfile b/docker/emscripten/Dockerfile
index f234e9ed..a213093c 100644
--- a/docker/emscripten/Dockerfile
+++ b/docker/emscripten/Dockerfile
@@ -16,10 +16,10 @@ RUN chown -R emscripten:emscripten /src
 
 USER emscripten
 
-COPY ISLE/emscripten/libwasmfs_fetch.js.patch /tmp/
+COPY ISLE/emscripten/emscripten.patch /tmp/
 RUN cd /emsdk/upstream/emscripten && \
-    git apply --check /tmp/libwasmfs_fetch.js.patch && \
-    git apply /tmp/libwasmfs_fetch.js.patch
+    git apply --check /tmp/emscripten.patch && \
+    git apply /tmp/emscripten.patch
 
 COPY --chown=emscripten:emscripten 3rdparty/ ./3rdparty/
 COPY --chown=emscripten:emscripten LEGO1/ ./LEGO1/