diff --git a/crypto_monitor_binance/templates/index.html b/crypto_monitor_binance/templates/index.html
index e6c487a..a3858ac 100644
--- a/crypto_monitor_binance/templates/index.html
+++ b/crypto_monitor_binance/templates/index.html
@@ -377,7 +377,7 @@
                 <button type="submit">手动划转</button>
             </form>
             <form id="add-order-form" action="/add_order" method="post" class="form-row" data-risk-percent="{{ risk_percent }}">
-                {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction %}
+                {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction with context %}
                 {{ trade_policy_symbol('symbol', 'order-symbol') }}
                 {{ trade_policy_direction('direction', 'order-direction') }}
                 <select id="sltp-mode" name="sltp_mode">
diff --git a/crypto_monitor_gate/templates/index.html b/crypto_monitor_gate/templates/index.html
index 56314e9..bfea42d 100644
--- a/crypto_monitor_gate/templates/index.html
+++ b/crypto_monitor_gate/templates/index.html
@@ -357,7 +357,7 @@
             </div>
             {% include 'order_monitor_rule_tips_gate.html' %}
             <form id="add-order-form" action="/add_order" method="post" class="form-row" data-risk-percent="{{ risk_percent }}">
-                {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction %}
+                {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction with context %}
                 {{ trade_policy_symbol('symbol', 'order-symbol') }}
                 {{ trade_policy_direction('direction', 'order-direction') }}
                 <select id="sltp-mode" name="sltp_mode">
diff --git a/crypto_monitor_okx/templates/index.html b/crypto_monitor_okx/templates/index.html
index a9b8fa6..a697191 100644
--- a/crypto_monitor_okx/templates/index.html
+++ b/crypto_monitor_okx/templates/index.html
@@ -386,7 +386,7 @@
                 <button type="submit">手动划转</button>
             </form>
             <form id="add-order-form" action="/add_order" method="post" class="form-row" data-risk-percent="{{ risk_percent }}">
-                {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction %}
+                {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction with context %}
                 {{ trade_policy_symbol('symbol', 'order-symbol') }}
                 {{ trade_policy_direction('direction', 'order-direction') }}
                 <select id="sltp-mode" name="sltp_mode">
diff --git a/lib/instance/templates/embed_page_fragment.html b/lib/instance/templates/embed_page_fragment.html
index 5b6cf2a..3551a4a 100644
--- a/lib/instance/templates/embed_page_fragment.html
+++ b/lib/instance/templates/embed_page_fragment.html
@@ -34,7 +34,7 @@
             </div>
             {% include order_rule_tips_tpl %}
             <form id="add-order-form" action="/add_order" method="post" class="form-row" data-risk-percent="{{ risk_percent }}">
-                {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction %}
+                {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction with context %}
                 {{ trade_policy_symbol('symbol', 'order-symbol') }}
                 {{ trade_policy_direction('direction', 'order-direction') }}
                 <select id="sltp-mode" name="sltp_mode">
diff --git a/lib/strategy/templates/key_focus_v2.html b/lib/strategy/templates/key_focus_v2.html
index 6fbd0b6..fde6f65 100644
--- a/lib/strategy/templates/key_focus_v2.html
+++ b/lib/strategy/templates/key_focus_v2.html
@@ -34,7 +34,7 @@
     </div>
     <div class="row" style="margin-top:10px">
       <label>币种</label>
-      {% from 'trade_policy_fields.html' import trade_policy_symbol %}
+      {% from 'trade_policy_fields.html' import trade_policy_symbol with context %}
       {{ trade_policy_symbol('symbol', 'symbol-input', default_symbol, placeholder='BTC/USDT') }}
       <label>关键位</label>
       <select id="key-id">
diff --git a/lib/strategy/templates/key_monitor_panel.html b/lib/strategy/templates/key_monitor_panel.html
index 9757ed5..d69a268 100644
--- a/lib/strategy/templates/key_monitor_panel.html
+++ b/lib/strategy/templates/key_monitor_panel.html
@@ -142,7 +142,7 @@
         {% endif %}
     </div>
     <form id="key-form" action="/add_key" method="post" class="form-row">
-        {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction %}
+        {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction with context %}
         {{ trade_policy_symbol('symbol', 'key-symbol') }}
         <select name="type" id="key-type-select" required>
             {% if position_sizing_mode != 'full_margin' %}
diff --git a/lib/strategy/templates/strategy_trend_panel.html b/lib/strategy/templates/strategy_trend_panel.html
index 7e5271a..9c17d30 100644
--- a/lib/strategy/templates/strategy_trend_panel.html
+++ b/lib/strategy/templates/strategy_trend_panel.html
@@ -24,7 +24,7 @@
     {% endfor %}
     {% endif %}
     <form id="trend-pullback-form" action="{{ url_for('preview_trend_pullback') }}" method="post" class="form-row">
-        {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction %}
+        {% from 'trade_policy_fields.html' import trade_policy_symbol, trade_policy_direction with context %}
         {{ trade_policy_symbol('symbol', 'trend-symbol', placeholder='BTC 或 ETH/USDT') }}
         {{ trade_policy_direction('direction', 'trend-direction') }}
         <input name="leverage" type="number" min="1" step="1" placeholder="杠杆(必填)" required>
diff --git a/lib/strategy/templates/trade_policy_fields.html b/lib/strategy/templates/trade_policy_fields.html
index fe63bd3..373fa23 100644
--- a/lib/strategy/templates/trade_policy_fields.html
+++ b/lib/strategy/templates/trade_policy_fields.html
@@ -1,4 +1,7 @@
-{# 方向 / 币种：env 账户级限制（三所共用宏） #}
+{# 方向 / 币种：env 账户级限制（三所共用宏）；调用方须 with context #}
+{% if trade_policy is not defined %}
+{% set trade_policy = {'symbol_restrict_enabled': false, 'direction_restrict_enabled': false, 'symbol_whitelist': [], 'allows_long': true, 'allows_short': true, 'direction_mode': 'both', 'badge_text': ''} %}
+{% endif %}
 {% macro trade_policy_symbol(name, id, value='', required=true, placeholder='BTC 或 BTC/USDT') -%}
 {% if trade_policy.symbol_restrict_enabled and trade_policy.symbol_whitelist %}
 <select name="{{ name }}" id="{{ id }}" {% if required %}required{% endif %} class="trade-policy-symbol-select">
diff --git a/scripts/diag_render_pages.py b/scripts/diag_render_pages.py
new file mode 100644
index 0000000..a89e585
--- /dev/null
+++ b/scripts/diag_render_pages.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+"""Diagnose page render errors (run inside instance dir with venv)."""
+from __future__ import annotations
+
+import os
+import sys
+import traceback
+
+
+def main() -> int:
+    inst = sys.argv[1] if len(sys.argv) > 1 else "crypto_monitor_binance"
+    root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+    os.chdir(os.path.join(root, inst))
+    sys.path.insert(0, os.getcwd())
+    from app import app  # noqa: WPS433
+
+    paths = ["/trade", "/key_monitor", "/strategy", "/login"]
+    with app.test_client() as client:
+        with client.session_transaction() as sess:
+            sess["logged_in"] = True
+        for path in paths:
+            try:
+                resp = client.get(path)
+                print(f"{inst} {path} -> {resp.status_code}")
+                if resp.status_code >= 400:
+                    body = resp.get_data(as_text=True)
+                    print(body[:3000])
+            except Exception:
+                print(f"{inst} {path} -> EXCEPTION")
+                traceback.print_exc()
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())