diff --git a/docker/frontend/src/Library.tsx b/docker/frontend/src/Library.tsx
index 85c0e19..0c42424 100644
--- a/docker/frontend/src/Library.tsx
+++ b/docker/frontend/src/Library.tsx
@@ -825,27 +825,23 @@ function Catalogue() {
   // either way.
   const synced = useRef(0);
   useEffect(() => {
-    const root = folders.find((f) => f.name === rootKey);
-    if (!loaded || !root || !ready.has(root.name)) return;
+    if (!loaded) return;
     // Another window may hold the reading — the app beside the browser, which
     // this window cannot see. Asking is a round trip, and the answer is what
     // keeps this one from reading the same roll a second time.
     const catchUp = () => {
       if (scanSession()) return;
-      // A folder of a hundred thousand frames is a hundred thousand stats on the
-      // disk, and this screen is raised every time the reader comes back from the
-      // studio — so the walk waits for the folder to have had a moment to change,
-      // which is a second of a roll the reader was not going to notice and not
-      // the several it took to walk it again.
       if (Date.now() - synced.current < CATCHUP_MS) return;
       synced.current = Date.now();
       void scanBusy().then(async (busy) => {
         if (busy || scanSession()) return;
-        // A position left on the disk is a roll that stopped in the middle of
-        // itself and the only thing that finishes it is reading it again. This
-        // is the question, and it is answered by one small file opened and shut
-        // — not by the walk it decides on.
-        if (await unfinished(root.name)) void scan(root, true);
+        for (const folder of folders) {
+          if (!ready.has(folder.name)) continue;
+          if (await unfinished(folder.name)) {
+            void scan(folder, false);
+            break;
+          }
+        }
       });
     };
     catchUp();
@@ -854,9 +850,7 @@ function Catalogue() {
     };
     document.addEventListener('visibilitychange', raised);
     return () => document.removeEventListener('visibilitychange', raised);
-    // `folders` and `ready` are read here, not watched: the two only ever gain a
-    // name or a permission, and neither is a reason to read the disk again.
-  }, [loaded, rootKey, scan]);
+  }, [loaded, folders, ready, scan]);
 
   const add = useCallback(async () => {
     setNote(null);
@@ -1017,20 +1011,24 @@ function Catalogue() {
     const add = (folder: string, rel: string, counted: boolean) => {
       const normF = (folder || '').replace(/\\/g, '/');
       const normRel = (rel || '').replace(/\\/g, '/');
-      const set = foldersUnder.get(normF) ?? new Set<string>();
-      foldersUnder.set(normF, set);
+      const lowerF = normF.toLowerCase();
+      const set = foldersUnder.get(lowerF) ?? new Set<string>();
+      foldersUnder.set(lowerF, set);
       let path = '';
       for (const part of normRel.split('/')) {
         if (!part) continue;
         path = path ? `${path}/${part}` : part;
         set.add(path);
-        if (counted) hits.set(`${normF}/${path}`, (hits.get(`${normF}/${path}`) ?? 0) + 1);
+        if (counted) {
+          const key = `${lowerF}/${path.toLowerCase()}`;
+          hits.set(key, (hits.get(key) ?? 0) + 1);
+        }
       }
     };
     for (const photo of photos) {
       const normF = (photo.folder || '').replace(/\\/g, '/');
       const normDir = (photo.dir || '').replace(/\\/g, '/');
-      hits.set(normF, (hits.get(normF) ?? 0) + 1);
+      hits.set(normF.toLowerCase(), (hits.get(normF.toLowerCase()) ?? 0) + 1);
       if (normDir) add(normF, normDir, true);
     }
     for (const dir of dirs) add(dir.folder, dir.rel, false);
@@ -1039,26 +1037,28 @@ function Catalogue() {
 
   const nodes = useMemo<Node[]>(() => {
     const { hits, foldersUnder } = baseTreeInfo;
-    const counted = (key: string, hit: number | undefined) => {
+    const counted = (key: string) => {
       const normKey = (key || '').replace(/\\/g, '/');
       const lowerKey = normKey.toLowerCase();
+      const hitVal = hits.get(lowerKey) ?? 0;
       const readVal = read?.[normKey] ?? read?.[lowerKey] ?? read?.[key] ?? 0;
-      return Math.max(hit ?? 0, readVal);
+      return Math.max(hitVal, readVal);
     };
     const out: Node[] = [];
     for (const folder of folders) {
       const normF = (folder.name || '').replace(/\\/g, '/');
-      out.push({ key: normF, label: folder.label || folder.name, depth: 0, count: counted(normF, hits.get(normF)) });
+      const lowerF = normF.toLowerCase();
+      out.push({ key: normF, label: folder.label || folder.name, depth: 0, count: counted(normF) });
       // Path order puts a folder before its own children, which is the order the
       // indented rows have to come in.
-      for (const dir of [...(foldersUnder.get(normF) ?? [])].sort((a, b) => a.localeCompare(b))) {
+      for (const dir of [...(foldersUnder.get(lowerF) ?? [])].sort((a, b) => a.localeCompare(b))) {
         const parts = dir.split('/');
         const key = `${normF}/${dir}`;
         out.push({
           key,
           label: parts[parts.length - 1],
           depth: parts.length,
-          count: counted(key, hits.get(key)),
+          count: counted(key),
         });
       }
     }
diff --git a/docker/frontend/src/engine/library.ts b/docker/frontend/src/engine/library.ts
index 138ea29..8c36cc2 100644
--- a/docker/frontend/src/engine/library.ts
+++ b/docker/frontend/src/engine/library.ts
@@ -46,7 +46,7 @@ const LANES = 4;
 // How often the walk's position is written down, in the same seconds as the
 // catalogue is read back on: the position is the whole of what the walk has found
 // and not read, and writing it is a string of a few megabytes on a long roll.
-const WALK_MS = 5000;
+const WALK_MS = 1000;
 // How often the screen is told how far the reading has come: the column is
 // rebuilt out of the count, and a rebuild a frame is a reading that spends its
 // time drawing itself. Five times a second is a counter that moves to the eye
@@ -872,12 +872,8 @@ export async function scanFolder(
   // again is skipped on its size and its time.
   let wroteAt = 0;
   const write = async () => {
-    // A reading kept to one folder has no position to write: the file it would
-    // go in is the whole roll's, and a fraction of the tree written there is a
-    // roll that comes back with the rest of itself missing.
-    if (bounded) return;
     const at = Date.now();
-    if (at - wroteAt < WALK_MS) return;
+    if (wroteAt !== 0 && at - wroteAt < WALK_MS) return;
     wroteAt = at;
     const held = [...inHand, ...batch.map(pathOf)];
     const savedEntries = entries.slice(0, 500).map((e) => e.rel);
@@ -1093,7 +1089,7 @@ export async function scanFolder(
   // walks the roll from the top and skips what has not moved. A reading kept to
   // one folder never wrote one down, and the file it would clear is the whole
   // roll's — a position another reading is in the middle of.
-  if (!stop && !bounded) await clearWalk(folder.name);
+  if (!stop) await clearWalk(folder.name);
   // The last word, whatever the clock says: the frames the reading got to are
   // the frames the column is about to be told about one last time.
   publish(true);
diff --git a/docker/recipescam-images.tar.gz.sha256 b/docker/recipescam-images.tar.gz.sha256
index 05b553e..6d19873 100644
--- a/docker/recipescam-images.tar.gz.sha256
+++ b/docker/recipescam-images.tar.gz.sha256
@@ -1 +1 @@
-d01beb3a629be66f3e70b82a325b26c92dd620e79a41de3ab73a578781f5bf45  recipescam-images.tar.gz
+3c54c3f27787b7c1a660483aaed2a310eef61b466e8251767b4ef2d80b3d6505  recipescam-images.tar.gz