diff --git a/public/js/exhibit.js b/public/js/exhibit.js
index 60b8fb4..ab00a18 100644
--- a/public/js/exhibit.js
+++ b/public/js/exhibit.js
@@ -26,6 +26,7 @@ const ENGINES = ['opencv', 'posit'];
 let engine = localStorage.getItem('nbx.engine') || 'opencv';
 if (!ENGINES.includes(engine)) engine = 'opencv';
 let cvState = 'idle';   // idle | loading | ready | failed
+let cvNote = '';        // download % / init stage while loading
 function setEngine(e) { engine = e; localStorage.setItem('nbx.engine', e); }
 
 /* Camera-frame correction for the POSIT path (unchanged from v2; the opencv path
@@ -72,7 +73,7 @@ function updateDbg(fusedQuat, markerCount, extra) {
   const up = _dbgV.set(0, 1, 0).applyQuaternion(camera3.quaternion).clone();
   const v3 = v => `(${v.x.toFixed(2)},${v.y.toFixed(2)},${v.z.toFixed(2)})`;
   const modeLine = engine === 'opencv'
-    ? `axis ${cvSolver ? cvSolver.getAxisMode() : 'std'}  cv:${cvState}`
+    ? `axis ${cvSolver ? cvSolver.getAxisMode() : 'std'}  cv:${cvState}${cvNote ? ' ' + cvNote : ''}`
     : `rot ${getRotMode()}  cam ${camMode}`;
   dbgEl.textContent =
     `eng ${engine}  ${freezeGhosts ? 'FROZEN' : 'moving'}\n` +
@@ -131,12 +132,13 @@ async function applyLanding() {
  * posit engine takes over automatically — visitors always get a working exhibit. */
 function ensureOpenCV() {
   if (cvState === 'ready' || cvState === 'loading') return;
+  // 'failed' falls through: tapping back to opencv retries the load
   cvState = 'loading';
-  loadOpenCV().then(() => {
-    cvState = 'ready';
+  loadOpenCV('/vendor/opencv.js', (p) => { cvNote = typeof p === 'number' ? p + '%' : String(p); }).then(() => {
+    cvState = 'ready'; cvNote = '';
     if (engine === 'opencv') toast('Tracking engine ready');
   }).catch((e) => {
-    cvState = 'failed';
+    cvState = 'failed'; cvNote = '';
     console.warn('opencv.js unavailable, falling back to posit', e);
     if (engine === 'opencv') { setEngine('posit'); toast('Using classic tracking'); }
   });