diff --git a/core/task_manager.py b/core/task_manager.py
index 76cc08e..b79a5b4 100644
--- a/core/task_manager.py
+++ b/core/task_manager.py
@@ -744,6 +744,7 @@ class TaskManager:
                 "progress": w.get("progress", {}),
                 "current_action": w.get("current_action", ""),
                 "last_error": w.get("last_error", ""),
+                "last_warning": w.get("last_warning", ""),
                 "running_job": r.get("job_id", ""),
                 "task_job": w.get("task_job", ""),
                 "attempt": r.get("attempt", 0),
diff --git a/static/admin/monitor.js b/static/admin/monitor.js
index 699a6c9..ca483c1 100644
--- a/static/admin/monitor.js
+++ b/static/admin/monitor.js
@@ -454,6 +454,8 @@ function renderDeviceRow(dev){
   const retry=dev.attempt>0?' <span class="text-muted">'+dev.attempt+'次</span>':'';
   // 预计结束时间（设置了运行时长上限时显示）
   const endInfo=(dev.worker_status==='running'&&dev.end_time)?'<div style="font-size:11px;color:#94a3b8">预计结束 '+new Date(dev.end_time*1000).toLocaleTimeString()+'</div>':'';
+  // 选择器健康警告（某步骤连续未找到元素，可能 App 改版选择器失效）
+  const warnInfo=dev.last_warning?'<div style="font-size:11px;color:#f59e0b" title="'+esc(dev.last_warning)+'">⚠ '+esc(dev.last_warning)+'</div>':'';
   const stopBtn=(dev.worker_status==='running'||dev.worker_status==='connecting')?'<button class="btn btn-danger btn-xs" onclick="apiAction(\'/api/stop_device\',{serial:\''+esc(dev.serial)+'\'})">停止</button>':'';
   // 截图按钮（任何状态都可看，离线时会报错）
   const shotBtn='<button class="btn btn-xs" onclick="openScreenshot(\''+esc(dev.serial)+'\')" title="查看设备画面（不影响任务）">截图</button>';
@@ -464,7 +466,7 @@ function renderDeviceRow(dev){
   const checked=_selectedSerials.has(dev.serial)?'checked':'';
   const rowCls=_selectedSerials.has(dev.serial)?'row-checked':'';
   const cb='<input type="checkbox" '+checked+' onclick="toggleDevice(\''+esc(dev.serial)+'\',this.checked)">';
-  return '<tr class="'+rowCls+'"><td class="col-cb">'+cb+'</td><td>'+devLabel+'</td><td>'+esc(dev.model)+'</td><td>'+stf+offline+'</td><td>'+wb+'</td><td>'+fg+'</td><td>'+prog+'</td><td>'+tname+retry+endInfo+'</td><td class="text-muted">'+esc(dev.current_action||'-')+'</td><td class="err-text" title="'+esc(dev.last_error||'')+'">'+esc(dev.last_error||'-')+'</td><td>'+btns+'</td></tr>';
+  return '<tr class="'+rowCls+'"><td class="col-cb">'+cb+'</td><td>'+devLabel+'</td><td>'+esc(dev.model)+'</td><td>'+stf+offline+'</td><td>'+wb+'</td><td>'+fg+'</td><td>'+prog+'</td><td>'+tname+retry+endInfo+'</td><td class="text-muted">'+esc(dev.current_action||'-')+warnInfo+'</td><td class="err-text" title="'+esc(dev.last_error||'')+'">'+esc(dev.last_error||'-')+'</td><td>'+btns+'</td></tr>';
 }
 
 async function loadJobsForMonitor(){
diff --git a/tasks/generic/task.py b/tasks/generic/task.py
index ff6cebe..468af01 100644
--- a/tasks/generic/task.py
+++ b/tasks/generic/task.py
@@ -83,6 +83,25 @@ class GenericStepsWorker(BaseWorker):
         self.max_duration = int(p.get("max_duration", 0))
         self.steps = p.get("steps", [])
         self._action_counts = {}   # 步骤执行计数 {step_label: count}
+        self._miss_counts = {}     # 选择器健康：selector -> 连续未命中次数
+
+    # 某 click 选择器连续未找到元素的次数达到该值，判定可能失效（App 改版）
+    _MAX_CONSECUTIVE_MISS = 10
+
+    def _track_selector_health(self, sel_val, found):
+        """记录某选择器的连续未命中次数，达到阈值上报 last_warning 并重置计数。
+
+        用于发现"选择器失效但任务仍显示成功"的静默空转问题（如 App 改版后元素找不到了）。
+        """
+        if found:
+            self._miss_counts.pop(sel_val, None)
+            return
+        n = self._miss_counts.get(sel_val, 0) + 1
+        self._miss_counts[sel_val] = n
+        if n >= self._MAX_CONSECUTIVE_MISS:
+            _log.error(f"[{self.serial}] 选择器连续 {n} 次未找到元素，可能已失效（App 改版？）：{sel_val}")
+            _update_status(self.serial, last_warning=f"选择器连续{n}次未命中")
+            self._miss_counts.pop(sel_val, None)  # 已上报，重置避免刷屏
 
     def run_task(self, d):
         """按 steps 顺序执行。loop 步骤递归执行其 children。"""
@@ -179,6 +198,7 @@ class GenericStepsWorker(BaseWorker):
         # 兼容旧配置：selector_type 不是 xpath 但值是 XPath（以 // 开头）
         if sel_type != "xpath" and sel_val.strip().startswith("//"):
             sel_type = "xpath"
+        found = False
         try:
             if sel_type == "xpath":
                 # u2 的 d.xpath() 返回 XPathSelector，exists 是属性需用 wait()
@@ -186,6 +206,7 @@ class GenericStepsWorker(BaseWorker):
                 if el.wait(timeout=timeout):
                     el.click()
                     _log.info(f"[{self.serial}] click 命中: xpath={sel_val}")
+                    found = True
                 else:
                     _log.warning(f"[{self.serial}] click 未找到元素: xpath={sel_val} (等待{timeout}s)")
             else:
@@ -194,8 +215,10 @@ class GenericStepsWorker(BaseWorker):
                 if el.exists(timeout=timeout):
                     el.click()
                     _log.info(f"[{self.serial}] click 命中: {sel_type}={sel_val}")
+                    found = True
                 else:
                     _log.warning(f"[{self.serial}] click 未找到元素: {sel_type}={sel_val} (等待{timeout}s)")
+            self._track_selector_health(sel_val, found)
         except Exception as e:
             _log.warning(f"[{self.serial}] click 异常: {e}")