diff --git a/YACReader/mouse_handler.cpp b/YACReader/mouse_handler.cpp
index dcdfec9f4..9cb3aac82 100644
--- a/YACReader/mouse_handler.cpp
+++ b/YACReader/mouse_handler.cpp
@@ -109,7 +109,9 @@ void YACReader::MouseHandler::mouseMoveEvent(QMouseEvent *event)
                     if (gtfPos.y() < 0 || gtfPos.x() < 0 || gtfPos.x() > viewer->goToFlow->width()) // TODO this extra check is for Mavericks (mouseMove over goToFlowGL seems to be broken)
                         viewer->animateHideGoToFlow();
                     // goToFlow->hide();
-                } else {
+                } else if (!viewer->magnifyingGlassShown) {
+                    // Don't pop up the bottom page-selection bar while the
+                    // magnifying glass is active: it prevents magnifying that area.
                     int umbral = (viewer->width() - viewer->goToFlow->width()) / 2;
                     if ((position.y() > viewer->height() - 15) && (position.x() > umbral) && (position.x() < viewer->width() - umbral)) {
 
diff --git a/YACReader/viewer.cpp b/YACReader/viewer.cpp
index df7cbacc9..17d6d1903 100644
--- a/YACReader/viewer.cpp
+++ b/YACReader/viewer.cpp
@@ -1070,8 +1070,12 @@ QImage Viewer::grabMagnifiedRegion(const QPoint &viewerPos, const QSize &glassSi
     }
 
     if (outImage) {
+        // The magnified image is kept at source resolution (device pixel ratio 1),
+        // matching the in-bounds path below. Do NOT set a >1 device pixel ratio here:
+        // a QPainter draws in logical coordinates, so painting the DPR-1 source crop
+        // onto a DPR>1 image would scale the content up by the ratio (and clip it),
+        // producing a sudden magnification jump at the image edges on HiDPI displays.
         QImage img(zoomWScaled, zoomHScaled, QImage::Format_RGB32);
-        img.setDevicePixelRatio(devicePixelRatioF());
         img.fill(bgColor);
         if (zw > 0 && zh > 0) {
             QPainter painter(&img);