diff --git a/.github/actions/setup-windows-opengl/action.yml b/.github/actions/setup-windows-opengl/action.yml
new file mode 100644
index 0000000..8578f24
--- /dev/null
+++ b/.github/actions/setup-windows-opengl/action.yml
@@ -0,0 +1,25 @@
+name: Set up Windows software OpenGL
+description: Install a pinned Mesa driver on the runner for native graphics smoke checks.
+runs:
+  using: composite
+  steps:
+    - shell: pwsh
+      run: |
+        # Hyper-V's inbox OpenGL driver lacks Processing's framebuffer support.
+        # Install the CI host driver after packaging; downloads keep their own runtime.
+        $mesaDirectory = Join-Path $env:RUNNER_TEMP 'scratch4j-mesa'
+        $mesaArchive = Join-Path $env:RUNNER_TEMP 'mesa3d-26.2.4-release-msvc.7z'
+        Invoke-WebRequest 'https://github.com/pal1000/mesa-dist-win/releases/download/26.2.4/mesa3d-26.2.4-release-msvc.7z' -OutFile $mesaArchive
+        $expectedHash = '351fc8c8b695878ffb3eaa044b3ead08672a48b1a045e3c3e3975811df0f6695'
+        if ((Get-FileHash $mesaArchive -Algorithm SHA256).Hash.ToLowerInvariant() -ne $expectedHash) {
+          throw 'Mesa archive checksum mismatch'
+        }
+        & 7z x -y "-o$mesaDirectory" $mesaArchive | Out-Null
+        if ($LASTEXITCODE -ne 0) { throw 'Mesa archive extraction failed' }
+        & (Join-Path $mesaDirectory 'systemwidedeploy.cmd') 1
+        if ($LASTEXITCODE -ne 0) { throw 'Mesa driver installation failed' }
+        if (!(Test-Path (Join-Path $env:SystemRoot 'System32/mesadrv.dll'))) {
+          throw 'Mesa system OpenGL driver is missing'
+        }
+        'GALLIUM_DRIVER=llvmpipe' >> $env:GITHUB_ENV
+        'LIBGL_ALWAYS_SOFTWARE=1' >> $env:GITHUB_ENV
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e499d7e..4f5fd5b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,11 +25,26 @@ jobs:
       - name: Build and test
         run: mvn --batch-mode --no-transfer-progress verify
 
+      - name: Identify the bundled library release
+        if: runner.os == 'Linux'
+        id: library-release
+        run: |
+          python3 - <<'PY'
+          import os
+          import xml.etree.ElementTree as ET
+          namespace = '{http://maven.apache.org/POM/4.0.0}'
+          version = ET.parse('pom.xml').findtext(f'{namespace}properties/{namespace}scratch.version')
+          if not version:
+              raise SystemExit('Missing bundled library version')
+          with open(os.environ['GITHUB_OUTPUT'], 'a') as output:
+              print('ref=v' + version, file=output)
+          PY
       - name: Check shared release metadata
         if: runner.os == 'Linux'
         uses: actions/checkout@v7
         with:
           repository: openpatch/scratch-for-java
+          ref: ${{ steps.library-release.outputs.ref }}
           path: .validation/library
       - name: Set up the catalog toolchain
         if: runner.os == 'Linux'
diff --git a/.github/workflows/package.yml b/.github/workflows/package.yml
index 7f2945d..3dd05d4 100644
--- a/.github/workflows/package.yml
+++ b/.github/workflows/package.yml
@@ -128,6 +128,10 @@ jobs:
             & $signtool.FullName sign /f $pfx /p $env:WINDOWS_CERTIFICATE_PASSWORD /fd SHA256 /tr http://timestamp.digicert.com /td SHA256 $_.FullName
           }
 
+      - name: Set up Windows software OpenGL
+        if: runner.os == 'Windows'
+        uses: ./.github/actions/setup-windows-opengl
+
       - name: Start packaged Studio and run offline projects
         shell: bash
         run: |
diff --git a/scripts/smoke-packaged.py b/scripts/smoke-packaged.py
index d5a8e00..a9268ed 100644
--- a/scripts/smoke-packaged.py
+++ b/scripts/smoke-packaged.py
@@ -23,5 +23,5 @@
     report = Path(temporary) / "report.txt"
     message = report.read_text() if report.is_file() else "No packaged smoke report"
     if result.returncode or not message.startswith("PASS:"):
-        raise SystemExit(message + "\n" + result.stdout[-2000:] + result.stderr[-4000:])
+        raise SystemExit(message + "\n" + result.stdout[-64000:] + result.stderr[-10000:])
     print(message.strip())
diff --git a/ui/src/main/java/org/openpatch/scratch4j/ui/PackagedSmoke.java b/ui/src/main/java/org/openpatch/scratch4j/ui/PackagedSmoke.java
index 0fd4934..9381b5d 100644
--- a/ui/src/main/java/org/openpatch/scratch4j/ui/PackagedSmoke.java
+++ b/ui/src/main/java/org/openpatch/scratch4j/ui/PackagedSmoke.java
@@ -33,16 +33,32 @@ static void start(StudioApp app, javafx.stage.Stage stage, Path output) {
             Files.writeString(project.root().resolve("List.java"), "public class List<T> {}\n");
           }
           List<String> errors = new java.util.concurrent.CopyOnWriteArrayList<>();
+          List<String> outputLines = new java.util.concurrent.CopyOnWriteArrayList<>();
           AtomicLong frames = new AtomicLong(-1);
           RunHandle handle = new ProjectRunner().run(project,
               RunConfig.of(project.startStage()).withJava(java).withControl().withExitAfter(4),
               new RunListener() {
                 public void onStderr(String line) { errors.add(line); }
+                public void onStdout(String line) { outputLines.add(line); }
                 public void onFrames(long count) { frames.set(count); }
               });
           int code;
           try { code = handle.exitFuture().get(40, TimeUnit.SECONDS); }
-          catch (Exception e) { handle.stop(); throw e; }
+          catch (Exception e) {
+            Path jcmd = java.resolveSibling(isWindows() ? "jcmd.exe" : "jcmd");
+            try {
+              if (Files.isRegularFile(jcmd)) {
+                Process dump = new ProcessBuilder(jcmd.toString(), Long.toString(handle.pid()),
+                    "Thread.print").inheritIO().start();
+                if (!dump.waitFor(5, TimeUnit.SECONDS)) dump.destroyForcibly();
+              }
+            } catch (Exception diagnosticError) {
+              System.err.println("Thread diagnostic failed: " + diagnosticError);
+            }
+            handle.stop();
+            throw new IllegalStateException(name + " timed out; frames=" + frames.get()
+                + "; stdout=" + outputLines + "; stderr=" + errors, e);
+          }
           if (code != 0 || frames.get() <= 0) throw new IllegalStateException(name + " did not draw: " + code + " " + errors);
           Path source = project.root().resolve("MyStage.java");
           String saved = Files.readString(source);