diff --git a/src/logic/Screen.swift b/src/logic/Screen.swift
index fd8efd02..cbca6c0b 100644
--- a/src/logic/Screen.swift
+++ b/src/logic/Screen.swift
@@ -9,7 +9,7 @@ class Screen {
     static func preferred() -> NSScreen {
         switch Preferences.showOnScreen {
             case .includingMouse: return withMouse() ?? NSScreen.main! // .main as fall-back
-            case .active: return NSScreen.main!
+            case .active: return NSScreen.main! // macOS bug: this will return screens[0] if the main screen shows a fullscreen app
             case .includingMenubar: return NSScreen.screens.first!
         }
     }
diff --git a/src/ui/App.swift b/src/ui/App.swift
index f3cc01b2..92474ea9 100644
--- a/src/ui/App.swift
+++ b/src/ui/App.swift
@@ -195,7 +195,7 @@ class App: AppCenterApplication, NSApplicationDelegate {
         guard appIsBeingUsed else { return }
         thumbnailsPanel.thumbnailsView.updateItemsAndLayout(currentScreen)
         guard appIsBeingUsed else { return }
-        thumbnailsPanel.setFrame(thumbnailsPanel.thumbnailsView.frame, display: false)
+        thumbnailsPanel.setContentSize(thumbnailsPanel.thumbnailsView.frame.size)
         thumbnailsPanel.display()
         guard appIsBeingUsed else { return }
         Screen.repositionPanel(thumbnailsPanel, currentScreen, .appleCentered)
@@ -250,6 +250,8 @@ class App: AppCenterApplication, NSApplicationDelegate {
         guard appIsBeingUsed else { return }
         Applications.refreshBadges()
         guard appIsBeingUsed else { return }
+        thumbnailsPanel.makeKeyAndOrderFront(nil) // workaround: without this, switching between 2 monitors make thumbnailPanel invisible
+        guard appIsBeingUsed else { return }
         refreshOpenUi()
         guard appIsBeingUsed else { return }
         thumbnailsPanel.show()
diff --git a/src/ui/FeedbackWindow.swift b/src/ui/FeedbackWindow.swift
index ab2ed935..53e0f082 100644
--- a/src/ui/FeedbackWindow.swift
+++ b/src/ui/FeedbackWindow.swift
@@ -9,8 +9,8 @@ class FeedbackWindow: NSWindow {
     var canBecomeKey_ = true
     override var canBecomeKey: Bool { canBecomeKey_ }
 
-    override init(contentRect: NSRect, styleMask style: StyleMask, backing backingStoreType: BackingStoreType, defer flag: Bool) {
-        super.init(contentRect: .zero, styleMask: style, backing: backingStoreType, defer: flag)
+    convenience init() {
+        self.init(contentRect: .zero, styleMask: [.titled, .miniaturizable, .closable], backing: .buffered, defer: false)
         setupWindow()
         setupView()
     }
@@ -19,7 +19,6 @@ class FeedbackWindow: NSWindow {
         title = NSLocalizedString("Send feedback", comment: "")
         hidesOnDeactivate = false
         isReleasedWhenClosed = false
-        styleMask.insert([.miniaturizable, .closable])
     }
 
     private func setupView() {
diff --git a/src/ui/main-window/ThumbnailsPanel.swift b/src/ui/main-window/ThumbnailsPanel.swift
index 410bd650..a08b476c 100644
--- a/src/ui/main-window/ThumbnailsPanel.swift
+++ b/src/ui/main-window/ThumbnailsPanel.swift
@@ -5,7 +5,7 @@ class ThumbnailsPanel: NSPanel {
     override var canBecomeKey: Bool { true }
 
     convenience init() {
-        self.init(contentRect: .zero, styleMask: .nonactivatingPanel, backing: .buffered, defer: true)
+        self.init(contentRect: .zero, styleMask: .nonactivatingPanel, backing: .buffered, defer: false)
         isFloatingPanel = true
         updateFadeOutAnimation()
         hidesOnDeactivate = false
@@ -13,6 +13,8 @@ class ThumbnailsPanel: NSPanel {
         titleVisibility = .hidden
         backgroundColor = .clear
         contentView!.addSubview(thumbnailsView)
+        preservesContentDuringLiveResize = false
+        disableSnapshotRestoration()
         // 2nd highest level possible; this allows the app to go on top of context menus
         // highest level is .screenSaver but makes drag and drop on top the main window impossible
         level = .popUpMenu
diff --git a/src/ui/preferences-window/PreferencesWindow.swift b/src/ui/preferences-window/PreferencesWindow.swift
index 886b5583..93918a82 100644
--- a/src/ui/preferences-window/PreferencesWindow.swift
+++ b/src/ui/preferences-window/PreferencesWindow.swift
@@ -5,8 +5,8 @@ class PreferencesWindow: NSWindow, NSToolbarDelegate {
     var canBecomeKey_ = true
     override var canBecomeKey: Bool { canBecomeKey_ }
 
-    override init(contentRect: NSRect, styleMask style: StyleMask, backing backingStoreType: BackingStoreType, defer flag: Bool) {
-        super.init(contentRect: .zero, styleMask: style, backing: backingStoreType, defer: flag)
+    convenience init() {
+        self.init(contentRect: .zero, styleMask: [.titled, .miniaturizable, .closable], backing: .buffered, defer: false)
         setupWindow()
         setupView()
     }
@@ -14,7 +14,6 @@ class PreferencesWindow: NSWindow, NSToolbarDelegate {
     private func setupWindow() {
         isReleasedWhenClosed = false
         hidesOnDeactivate = false
-        styleMask.insert([.miniaturizable, .closable])
         addQuitButton()
     }