Index: scribus/ui/factories/scribusproxystyle.cpp
===================================================================
--- scribus/ui/factories/scribusproxystyle.cpp	(revision 27791 + preceding dark-theme fixes)
+++ scribus/ui/factories/scribusproxystyle.cpp	(working copy)
@@ -273,6 +273,17 @@
 #if (QT_VERSION >= QT_VERSION_CHECK(6, 8, 0))
 	blockRefresh = true;
 
+	auto& displayPrefs = PrefsManager::instance().appPrefs.displayPrefs;
+	const QColor windowColor = qApp->palette().color(QPalette::Active, QPalette::Window);
+	const QColor baseWindowColor = baseStyle()->standardPalette().color(QPalette::Active, QPalette::Window);
+	const QColor lightWindowColor = createLightPalette().color(QPalette::Active, QPalette::Window);
+	const QColor darkWindowColor = createDarkPalette().color(QPalette::Active, QPalette::Window);
+	// Scratch space historically stores the palette Window color itself. Accept
+	// palette-derived defaults saved under another theme, while preserving custom colors.
+	const bool useDefaultScratchColor =
+		(displayPrefs.scratchColor == windowColor || displayPrefs.scratchColor == baseWindowColor ||
+		 displayPrefs.scratchColor == lightWindowColor || displayPrefs.scratchColor == darkWindowColor);
+
 	// For Linux exception see bugreport: https://bugreports.qt.io/browse/QTBUG-132929
 
 	switch (theme)
@@ -300,6 +311,9 @@
 		break;
 	}
 
+	if (useDefaultScratchColor)
+		displayPrefs.scratchColor = qApp->palette().color(QPalette::Active, QPalette::Window);
+
 	blockRefresh = false;
 #endif
 }
Index: scribus/scribus.cpp
===================================================================
--- scribus/scribus.cpp	(revision 27791 + preceding dark-theme fixes)
+++ scribus/scribus.cpp	(working copy)
@@ -6582,10 +6582,6 @@
 	LocaleManager::instance().setUserPreferredLocale(m_prefsManager.appPrefs.uiPrefs.userPreferredLocale);
 	ScQApp->setLocale();
 
-	bool useDefaultScratchColor = false;
-	if (m_prefsManager.appPrefs.displayPrefs.scratchColor == QApplication::palette().color(QPalette::Active, QPalette::Window))
-		useDefaultScratchColor = true;
-
 #if (QT_VERSION >= QT_VERSION_CHECK(6, 8, 0))
 	QString newUIStylePalette = m_prefsManager.appPrefs.uiPrefs.stylePalette;
 	if (oldPrefs.uiPrefs.stylePalette != newUIStylePalette)
@@ -6621,9 +6617,6 @@
 		// 	m_prefsManager.appPrefs.uiPrefs.style = oldPrefs.uiPrefs.style;
 	}
 
-	if (useDefaultScratchColor)
-		m_prefsManager.appPrefs.displayPrefs.scratchColor = QApplication::palette().color(QPalette::Active, QPalette::Window);
-
 	QString newIconSet = m_prefsManager.guiIconSet();
 	// Recreate icons if icon set or GUI changed. For GUI change the icon recreation will automatically detect light and dark themes
 	if (oldPrefs.uiPrefs.iconSet != newIconSet || forceIconUpdate == true)
@@ -6648,6 +6641,10 @@
 	else
 		mdiArea->setViewMode(QMdiArea::SubWindowView);
 	bool shadowChanged = oldPrefs.displayPrefs.showPageShadow != m_prefsManager.showPageShadow();
+	bool scratchColorChanged = oldPrefs.displayPrefs.scratchColor != m_prefsManager.appPrefs.displayPrefs.scratchColor;
+	if (scratchColorChanged)
+		pagePalette->refreshPageGrid();
+
 	QList<QMdiSubWindow *> windows = mdiArea->subWindowList();
 	if (!windows.isEmpty())
 	{
@@ -6672,7 +6669,7 @@
 				scw_v->zoom((scw_v->scale() / oldPrefs.displayPrefs.displayScale) * m_prefsManager.displayScale());
 				zoomSpinBox->setMaximum(doc->opToolPrefs().magMax);
 			}
-			if (shadowChanged)
+			if (shadowChanged || scratchColorChanged)
 				scw->view()->DrawNew();
 		}
 	}
Index: scribus/ui/pagepalette.h
===================================================================
--- scribus/ui/pagepalette.h	(revision 27791 + preceding dark-theme fixes)
+++ scribus/ui/pagepalette.h	(working copy)
@@ -68,6 +68,7 @@
 	void markPage(uint nr);
 	void updateMasterPageList();
 	void updatePagePreviews();
+	void refreshPageGrid();
 
 	void languageChange();
 
Index: scribus/ui/pagepalette.cpp
===================================================================
--- scribus/ui/pagepalette.cpp	(revision 27791 + preceding dark-theme fixes)
+++ scribus/ui/pagepalette.cpp	(working copy)
@@ -165,6 +165,12 @@
 
 }
 
+void PagePalette::refreshPageGrid()
+{
+	if (m_pageWidget)
+		m_pageWidget->refreshPageGrid();
+}
+
 bool PagePalette::masterPageMode()
 {
 	PagePalette_MasterPages* mpWidget = dynamic_cast<PagePalette_MasterPages*>(this->currentWidget());
Index: scribus/ui/pagepalette_pages.h
===================================================================
--- scribus/ui/pagepalette_pages.h	(revision 27791 + preceding dark-theme fixes)
+++ scribus/ui/pagepalette_pages.h	(working copy)
@@ -27,6 +27,7 @@
 public:
 	PagePalette_Pages(QWidget* parent);
 	~PagePalette_Pages() {};
+	void refreshPageGrid();
 
 public slots:
 	void setView(ScribusView *view);
Index: scribus/ui/pagepalette_pages.cpp
===================================================================
--- scribus/ui/pagepalette_pages.cpp	(revision 27791 + preceding dark-theme fixes)
+++ scribus/ui/pagepalette_pages.cpp	(working copy)
@@ -240,6 +240,11 @@
 
 }
 
+void PagePalette_Pages::refreshPageGrid()
+{
+	pageViewWidget->pageGrid()->update();
+}
+
 void PagePalette_Pages::updatePagePreview()
 {
 	if (currView == nullptr || pageViewWidget->pageGrid()->pageList.empty())