diff --git a/.gitignore b/.gitignore
index f790c04..4cbb810 100644
--- a/.gitignore
+++ b/.gitignore
@@ -53,6 +53,7 @@ tests/*
 !tests/test_script_service_documentary_unittest.py
 !tests/test_generate_narration_script_documentary_unittest.py
 !tests/test_generate_script_docu_unittest.py
+!tests/test_streamlit_widget_session_state.py
 
 docs/reddit-community
 docs/wechat-0.8
diff --git a/tests/test_streamlit_widget_session_state.py b/tests/test_streamlit_widget_session_state.py
new file mode 100644
index 0000000..cd8b0c9
--- /dev/null
+++ b/tests/test_streamlit_widget_session_state.py
@@ -0,0 +1,84 @@
+"""Regression coverage for Streamlit widget state initialization."""
+
+import ast
+from pathlib import Path
+
+import pytest
+
+
+PROJECT_ROOT = Path(__file__).parents[1]
+
+
+def _attribute_name(node: ast.expr) -> str | None:
+    if isinstance(node, ast.Name):
+        return node.id
+    if isinstance(node, ast.Attribute):
+        parent = _attribute_name(node.value)
+        return f"{parent}.{node.attr}" if parent else node.attr
+    return None
+
+
+def _session_state_key(target: ast.expr) -> str | None:
+    if not isinstance(target, ast.Subscript):
+        return None
+    if _attribute_name(target.value) != "st.session_state":
+        return None
+    if isinstance(target.slice, ast.Constant) and isinstance(target.slice.value, str):
+        return target.slice.value
+    return None
+
+
+@pytest.mark.parametrize(
+    ("source_path", "function_name", "widget_key"),
+    [
+        (
+            "webui/components/audio_settings.py",
+            "render_bgm_settings",
+            "bgm_source_selection",
+        ),
+        (
+            "webui/components/subtitle_settings.py",
+            "_render_subtitle_preview_image",
+            "subtitle_preview_orientation",
+        ),
+    ],
+)
+def test_state_initialized_widgets_do_not_also_declare_defaults(
+    source_path: str,
+    function_name: str,
+    widget_key: str,
+):
+    """Streamlit warns when a keyed widget has both a default and state value."""
+    module = ast.parse((PROJECT_ROOT / source_path).read_text(encoding="utf-8"))
+    function = next(
+        node
+        for node in module.body
+        if isinstance(node, ast.FunctionDef) and node.name == function_name
+    )
+
+    assigned_keys = {
+        key
+        for node in ast.walk(function)
+        if isinstance(node, ast.Assign)
+        for target in node.targets
+        if (key := _session_state_key(target)) is not None
+    }
+    assert widget_key in assigned_keys
+
+    widget_calls = []
+    for node in ast.walk(function):
+        if not isinstance(node, ast.Call):
+            continue
+        widget_name = _attribute_name(node.func)
+        keywords = {keyword.arg: keyword.value for keyword in node.keywords}
+        key_node = keywords.get("key")
+        if (
+            widget_name is not None
+            and widget_name.startswith("st.")
+            and isinstance(key_node, ast.Constant)
+            and key_node.value == widget_key
+        ):
+            widget_calls.append(keywords)
+
+    assert widget_calls
+    assert all("default" not in keywords for keywords in widget_calls)
diff --git a/webui/components/audio_settings.py b/webui/components/audio_settings.py
index c9c2332..f5e606c 100644
--- a/webui/components/audio_settings.py
+++ b/webui/components/audio_settings.py
@@ -9,7 +9,7 @@ from app.models.schema import AudioVolumeDefaults
 from app.utils import utils
 
 
-INDEXTTS_REFERENCE_AUDIO_SOURCE_DIR = "/Users/viccy/Downloads/tts-mp3-clone/mp3"
+INDEXTTS_REFERENCE_AUDIO_SOURCE_DIR = utils.resource_dir("tts_reference_audio")
 INDEXTTS_REFERENCE_AUDIO_COPY_SUBDIR = "indextts_refs"
 INDEXTTS_REFERENCE_AUDIO_MAP = [
     ("yingshijieshuo-zh-male.mp3", "影视解说", "Film Narration"),
@@ -36,7 +36,7 @@ INDEXTTS_REFERENCE_AUDIO_MAP = [
     ("sarah-en-female.mp3", "莎拉", "Sarah"),
 ]
 INDEXTTS_REFERENCE_AUDIO_EXTENSIONS = (".mp3", ".wav", ".flac", ".m4a", ".aac", ".ogg")
-BGM_RESOURCE_DIR = "/Users/viccy/Downloads/tts-mp3-clone/bgms-safe"
+BGM_RESOURCE_DIR = utils.resource_dir("bgm")
 BGM_TRACKS_JSON = os.path.join(BGM_RESOURCE_DIR, "tracks.json")
 BGM_UPLOAD_SUBDIR = "uploaded_bgms"
 BGM_AUDIO_EXTENSIONS = (".mp3", ".wav", ".flac", ".m4a", ".aac", ".ogg")
@@ -1965,7 +1965,6 @@ def render_bgm_settings(tr):
         tr("Background Music Source"),
         options=list(bgm_source_labels.keys()),
         selection_mode="single",
-        default=default_bgm_source,
         key="bgm_source_selection",
         format_func=lambda source: tr(bgm_source_labels[source]),
         help=tr("Background Music Source Help"),
diff --git a/webui/components/subtitle_settings.py b/webui/components/subtitle_settings.py
index 22e88e8..7d1c81b 100644
--- a/webui/components/subtitle_settings.py
+++ b/webui/components/subtitle_settings.py
@@ -788,11 +788,10 @@ def _render_subtitle_preview_image(tr):
     orientation = st.pills(
         tr("Subtitle Preview Orientation"),
         options=SUBTITLE_PREVIEW_ORIENTATIONS,
-        default=orientation_default,
         format_func=lambda value: tr(SUBTITLE_PREVIEW_ORIENTATION_LABELS[value]),
         key="subtitle_preview_orientation",
         width="stretch",
-    ) or "portrait"
+    ) or orientation_default
     _render_subtitle_position_controls(tr, orientation)
 
     preview_text = tr("Subtitle Preview Sample Text")