diff --git a/src/app/main.cpp b/src/app/main.cpp
index e193ece..139c7b4 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -527,7 +527,10 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
             if (phase == geopro::controller::DatasetDetailController::LoadPhase::Grid)
                 detailPanel->setGridLoading(dsId, true);
         });
-    QObject::connect(&detailCtrl, &geopro::controller::DatasetDetailController::loadFailed, &window,
+    // context 用 detailPanel（与 loadStarted 一致）：detailPanel 析构即自动断连，避免野指针。
+    // window 比 detailPanel 活得久，lambda 捕 &window 取状态栏安全。loadFailed 无 phase：
+    // Chart 失败时 gridOverlay 本已隐藏，setGridLoading(false) 幂等无害；Grid 失败时正确清遮罩。
+    QObject::connect(&detailCtrl, &geopro::controller::DatasetDetailController::loadFailed, detailPanel,
                      [&window, detailPanel](const QString& dsId, const QString& msg) {
                          detailPanel->setGridLoading(dsId, false);
                          window.statusBar()->showMessage(
diff --git a/src/app/panels/DatasetDetailPage.cpp b/src/app/panels/DatasetDetailPage.cpp
index 061cbb6..7b5f47f 100644
--- a/src/app/panels/DatasetDetailPage.cpp
+++ b/src/app/panels/DatasetDetailPage.cpp
@@ -51,6 +51,7 @@ void DatasetDetailPage::setData(const geopro::controller::DatasetDetailControlle
     gridRequested_ = false;  // 新数据集 → 网格数据需重新按需加载
     rawView_->setData(d);
     gridView_->setData(d);
+    setGridLoading(false);   // 重开/换 ds：重置遮罩状态，避免上次的「加载中」残留
 }
 
 void DatasetDetailPage::setGridData(
diff --git a/src/app/panels/LoadingOverlay.cpp b/src/app/panels/LoadingOverlay.cpp
index 3b7e446..00bc80f 100644
--- a/src/app/panels/LoadingOverlay.cpp
+++ b/src/app/panels/LoadingOverlay.cpp
@@ -1,12 +1,12 @@
 #include "panels/LoadingOverlay.hpp"
 #include <QEvent>
 #include <QLabel>
-#include <QResizeEvent>
 #include <QVBoxLayout>
 
 namespace geopro::app {
 
 LoadingOverlay::LoadingOverlay(QWidget* parent) : QWidget(parent), label_(new QLabel(this)) {
+    Q_ASSERT(parent);  // 契约：必须有父（遮罩几何跟随父，无父无法工作）
     setAttribute(Qt::WA_StyledBackground, true);
     setStyleSheet(QStringLiteral("background: rgba(255,255,255,160);"));
     label_->setText(QStringLiteral("加载中…"));