diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index f166171..33ac339 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1580,7 +1580,10 @@ export default function App() {
   // Cached per-call slot status: "new" | "new-band" | "new-slot" | "worked".
   // Keyed by `${call}|${band}|${mode}` so two spots of the same call on
   // different slots don't share the same colour.
-  const [spotStatus, setSpotStatus] = useState<Record<string, { status: string; country?: string; continent?: string; worked_call?: boolean; new_county?: boolean; new_pota?: boolean; new_pfx?: boolean; pfx?: string }>>({});
+  // worked_slot must be carried explicitly like every other field: this map is
+  // assembled field by field, so a backend flag that nobody copies here simply
+  // never reaches the panels — silently, since the extra key is just dropped.
+  const [spotStatus, setSpotStatus] = useState<Record<string, { status: string; country?: string; continent?: string; worked_call?: boolean; worked_slot?: boolean; new_county?: boolean; new_pota?: boolean; new_pfx?: boolean; pfx?: string }>>({});
   // Live mirror of spotStatus so the incoming-spot buffer can tell which slots
   // still need resolving without re-subscribing the cluster:spot listener.
   const spotStatusRef = useRef(spotStatus);
@@ -1630,7 +1633,7 @@ export default function App() {
           const k = `${r.call}|${r.band ?? ''}|${(r.mode ?? '').toUpperCase()}`;
           next[k] = {
             status: r.status ?? '', country: r.country, continent: (r as any).continent,
-            worked_call: !!(r as any).worked_call, new_county: !!(r as any).new_county,
+            worked_call: !!(r as any).worked_call, worked_slot: !!(r as any).worked_slot, new_county: !!(r as any).new_county,
             new_pota: !!(r as any).new_pota, new_pfx: !!(r as any).new_pfx, pfx: (r as any).pfx,
           };
         }
@@ -2729,6 +2732,7 @@ export default function App() {
                 country: r.country,
                 continent: (r as any).continent,
                 worked_call: !!(r as any).worked_call,
+                worked_slot: !!(r as any).worked_slot,
                 new_county: !!(r as any).new_county,
                 new_pota: !!(r as any).new_pota,
                 new_pfx: !!(r as any).new_pfx,
@@ -3196,6 +3200,7 @@ export default function App() {
               country: r.country,
               continent: (r as any).continent,
               worked_call: !!(r as any).worked_call,
+              worked_slot: !!(r as any).worked_slot,
               new_county: !!(r as any).new_county,
               new_pota: !!(r as any).new_pota,
               new_pfx: !!(r as any).new_pfx,
diff --git a/frontend/src/components/BandMap.tsx b/frontend/src/components/BandMap.tsx
index af87296..d08ffed 100644
--- a/frontend/src/components/BandMap.tsx
+++ b/frontend/src/components/BandMap.tsx
@@ -243,13 +243,16 @@ export function BandMap({ band, spots, spotStatus: spotStatusRaw, currentFreqHz,
   // the map and the cluster list share the single rule set in lib/spotDisplay.
   // Re-derived whenever the poll delivers a new status map, which is also when a
   // just-changed option takes effect.
+  // Read at render time, not inside the memo: the options must be part of the
+  // dependencies. Keyed only on spotStatusRaw, toggling an option changed
+  // nothing until the next poll happened to hand over a fresh object.
+  const dispOpts = readSpotDisplayOptions();
   const spotStatus = useMemo(() => {
-    const o = readSpotDisplayOptions();
-    if (!o.muteWorked && !o.slotHighlight) return spotStatusRaw;
+    if (!dispOpts.muteWorked && !dispOpts.slotHighlight) return spotStatusRaw;
     const out: Record<string, SpotStatusEntry> = {};
-    for (const k of Object.keys(spotStatusRaw)) out[k] = applySpotDisplay(spotStatusRaw[k], o) as SpotStatusEntry;
+    for (const k of Object.keys(spotStatusRaw)) out[k] = applySpotDisplay(spotStatusRaw[k], dispOpts) as SpotStatusEntry;
     return out;
-  }, [spotStatusRaw]);
+  }, [spotStatusRaw, dispOpts.muteWorked, dispOpts.slotHighlight]);
   const range = BAND_RANGES[band];
   const segments = SEGMENT_COLORS[band] ?? [];
   const [zoomIdx, setZoomIdx] = useState(2); // default 32 px/kHz