diff --git a/lookyloo/capturecache.py b/lookyloo/capturecache.py
index 044a65e6..c3936594 100644
--- a/lookyloo/capturecache.py
+++ b/lookyloo/capturecache.py
@@ -156,7 +156,6 @@ class CapturesIndex(Mapping):  # type: ignore[type-arg]
 
     @property
     def cached_captures(self) -> set[str]:
-        self._quick_init()
         return set(self.__cache.keys())
 
     def __getitem__(self, uuid: str) -> CaptureCache:
diff --git a/lookyloo/lookyloo.py b/lookyloo/lookyloo.py
index f9a0f73c..b4262c82 100644
--- a/lookyloo/lookyloo.py
+++ b/lookyloo/lookyloo.py
@@ -190,6 +190,11 @@ class Lookyloo():
                                     loglevel=get_config('generic', 'loglevel'))
         return self._lacus
 
+    def update_cache_index(self) -> None:
+        '''Update the cache index with the latest captures'''
+        # NOTE: This call is moderately expensive as it iterates over all the non-archived captures
+        self._captures_index._quick_init()
+
     def add_context(self, capture_uuid: str, /, urlnode_uuid: str, *, ressource_hash: str,
                     legitimate: bool, malicious: bool, details: dict[str, dict[str, str]]) -> None:
         '''Adds context information to a capture or a URL node'''
diff --git a/website/web/__init__.py b/website/web/__init__.py
index 03545e6a..a206fa6c 100644
--- a/website/web/__init__.py
+++ b/website/web/__init__.py
@@ -1381,6 +1381,7 @@ def index_generic(show_hidden: bool=False, show_error: bool=True, category: str
         cut_time = (datetime.now() - timedelta(**time_delta_on_index))
         cut_time_with_tz = cut_time.replace(tzinfo=timezone.utc)
 
+    lookyloo.update_cache_index()
     for cached in lookyloo.sorted_capture_cache(index_cut_time=cut_time):
         if cut_time and cached.timestamp < cut_time_with_tz:
             continue
@@ -1548,7 +1549,7 @@ def ressource_by_hash(sha512: str) -> Response:
             filename, body, mimetype = ressource
             return send_file(body, as_attachment=True, download_name=filename)
 
-    return send_file(BytesIO(f'Unable to find {sha512}'.encode()), as_attachment=True, download_name='Hash unknown.')
+    return send_file(BytesIO(f'Unable to find {sha512}'.encode()), as_attachment=True, download_name='Unknown_Hash.txt')
 
 
 # ################## Submit existing capture ##################