diff --git a/Start ProdDash.command b/Start ProdDash.command
old mode 100644
new mode 100755
index 0ca52ec..43cd9b5
--- a/Start ProdDash.command	
+++ b/Start ProdDash.command	
@@ -1,4 +1,11 @@
 #!/bin/zsh
 # Double-click to start ProdDash (macOS)
 cd "$(dirname "$0")"
+# One dashboard per machine: take the port over from any prior instance
+# (an SSH- or launchd-started one has no microphone access for the LTC
+# listener — launching from here fixes that).
+OLD=$(lsof -t -iTCP:24500 -sTCP:LISTEN 2>/dev/null)
+[[ -n "$OLD" ]] && kill $OLD 2>/dev/null && sleep 1
+# Prefer the bundled runtime (production machines have no system Node)
+if [[ -x ./runtime/bin/node ]]; then exec ./runtime/bin/node server.js; fi
 exec node server.js