diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5eceb51..13eb465 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -160,6 +160,12 @@ jobs:
           grep -A4 'fn get_ffmpeg_target_os' "$BUILDRS"
           echo "MACOSX_DEPLOYMENT_TARGET=11.0" >> "$GITHUB_ENV"
 
+      - name: Clean stale nam-ffi build artifacts
+        shell: bash
+        run: |
+          rm -rf lightningbeam-ui/target/release/build/nam-ffi-*
+          rm -rf lightningbeam-ui/target/debug/build/nam-ffi-*
+
       - name: Build release binary
         shell: bash
         env:
@@ -167,9 +173,21 @@ jobs:
         run: |
           cd lightningbeam-ui
           if [ -n "${{ matrix.target }}" ]; then
-            cargo build --release --bin lightningbeam-editor --target ${{ matrix.target }}
+            cargo build -vv --release --bin lightningbeam-editor --target ${{ matrix.target }} 2>&1 | tee /tmp/build.log || {
+              echo "=== nam-ffi build output ==="
+              grep -A50 'running.*nam-ffi\|Compiling nam-ffi\|NeuralAudio' /tmp/build.log | head -80
+              echo "=== nam-ffi OUT_DIR contents ==="
+              find target -path '*/nam-ffi-*/out/build' -exec ls -R {} \; 2>/dev/null || echo "not found"
+              exit 1
+            }
           else
-            cargo build --release --bin lightningbeam-editor
+            cargo build -vv --release --bin lightningbeam-editor 2>&1 | tee /tmp/build.log || {
+              echo "=== nam-ffi build output ==="
+              grep -A50 'running.*nam-ffi\|Compiling nam-ffi\|NeuralAudio' /tmp/build.log | head -80
+              echo "=== nam-ffi OUT_DIR contents ==="
+              find target -path '*/nam-ffi-*/out/build' -exec ls -R {} \; 2>/dev/null || echo "not found"
+              exit 1
+            }
           fi
 
       - name: Copy cross-compiled binary to release dir