diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8a1a4b2..5f37570 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -94,7 +94,17 @@ jobs:
         run: vcpkg install liblo:x64-windows
 
       - name: Install NSIS
-        run: choco install nsis -y
+        run: |
+          $ErrorActionPreference = "Stop"
+          for ($i = 1; $i -le 3; $i++) {
+            choco install nsis -y --no-progress
+            if (Test-Path "C:\Program Files (x86)\NSIS\makensis.exe") { break }
+            Write-Host "NSIS not found after attempt $i; retrying..."
+            Start-Sleep -Seconds 15
+          }
+          if (-not (Test-Path "C:\Program Files (x86)\NSIS\makensis.exe")) {
+            throw "NSIS install failed: makensis.exe not found"
+          }
 
       - name: Set up MSVC
         uses: ilammy/msvc-dev-cmd@v1
diff --git a/tests/test_allenheath_session.cpp b/tests/test_allenheath_session.cpp
index 794d5da..f9a6e37 100644
--- a/tests/test_allenheath_session.cpp
+++ b/tests/test_allenheath_session.cpp
@@ -60,6 +60,17 @@ class StubMixRack : public QObject {
         while (!m_buffer.isEmpty()) {
             const quint8 lead = static_cast<quint8>(m_buffer.at(0));
             if (lead == 0xE0) {
+                // the seed is a fixed 8-byte frame; its port field can carry a
+                // 0xE7 byte, so it must be consumed by length, not by scanning
+                // for the E7 terminator (that would mis-frame ~1% of ports)
+                if (m_buffer.startsWith(QByteArray::fromHex("e000040103"))) {
+                    if (m_buffer.size() < 8) {
+                        return;
+                    }
+                    handleControl(m_buffer.left(8));
+                    m_buffer.remove(0, 8);
+                    continue;
+                }
                 const int end = m_buffer.indexOf('\xe7', 1);
                 if (end < 0) {
                     return;