diff --git a/SessionFlow.xcodeproj/project.pbxproj b/SessionFlow.xcodeproj/project.pbxproj
index 2b2144a..b870f33 100644
--- a/SessionFlow.xcodeproj/project.pbxproj
+++ b/SessionFlow.xcodeproj/project.pbxproj
@@ -571,7 +571,7 @@
 				CODE_SIGN_ENTITLEMENTS = SessionFlow/SessionFlow.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 754;
+				CURRENT_PROJECT_VERSION = 783;
 				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_ASSET_PATHS = "";
 				ENABLE_APP_SANDBOX = NO;
@@ -608,7 +608,7 @@
 				CODE_SIGN_ENTITLEMENTS = SessionFlow/SessionFlow.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 754;
+				CURRENT_PROJECT_VERSION = 783;
 				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_ASSET_PATHS = "";
 				ENABLE_APP_SANDBOX = NO;
diff --git a/SessionFlow/Services/MicrophoneMonitor.swift b/SessionFlow/Services/MicrophoneMonitor.swift
index 85c7a42..c9cbb7a 100644
--- a/SessionFlow/Services/MicrophoneMonitor.swift
+++ b/SessionFlow/Services/MicrophoneMonitor.swift
@@ -4,12 +4,17 @@ import Combine
 
 class MicrophoneMonitor: ObservableObject {
     @Published private(set) var isMicActive = false
+    /// True when the default input and output devices are the same hardware
+    /// (e.g. Thunderbolt Display), which causes false mic activation from audio playback.
+    @Published private(set) var inputOutputSharedDevice = false
+    @Published private(set) var sharedDeviceName: String?
 
     private var listenerBlock: AudioObjectPropertyListenerBlock?
     private var observedDevice: AudioDeviceID = 0
 
     init() {
         observeDefaultInputDevice()
+        checkSharedDevice()
     }
 
     deinit {
@@ -62,6 +67,7 @@ class MicrophoneMonitor: ObservableObject {
             DispatchQueue.main.async {
                 self?.removeListener()
                 self?.observeDefaultInputDevice()
+                self?.checkSharedDevice()
             }
         }
     }
@@ -85,6 +91,48 @@ class MicrophoneMonitor: ObservableObject {
         }
     }
 
+    /// Checks whether the default input and output devices are the same hardware.
+    private func checkSharedDevice() {
+        let inputID = defaultDeviceID(selector: kAudioHardwarePropertyDefaultInputDevice)
+        let outputID = defaultDeviceID(selector: kAudioHardwarePropertyDefaultOutputDevice)
+        let shared = inputID != 0 && inputID == outputID
+        if inputOutputSharedDevice != shared {
+            inputOutputSharedDevice = shared
+            sharedDeviceName = shared ? deviceName(for: inputID) : nil
+        }
+    }
+
+    private func defaultDeviceID(selector: AudioObjectPropertySelector) -> AudioDeviceID {
+        var address = AudioObjectPropertyAddress(
+            mSelector: selector,
+            mScope: kAudioObjectPropertyScopeGlobal,
+            mElement: kAudioObjectPropertyElementMain
+        )
+        var deviceID: AudioDeviceID = 0
+        var size = UInt32(MemoryLayout<AudioDeviceID>.size)
+        let status = AudioObjectGetPropertyData(
+            AudioObjectID(kAudioObjectSystemObject),
+            &address, 0, nil, &size, &deviceID
+        )
+        return status == noErr ? deviceID : 0
+    }
+
+    private func deviceName(for deviceID: AudioDeviceID) -> String? {
+        var address = AudioObjectPropertyAddress(
+            mSelector: kAudioObjectPropertyName,
+            mScope: kAudioObjectPropertyScopeGlobal,
+            mElement: kAudioObjectPropertyElementMain
+        )
+        var size: UInt32 = 0
+        guard AudioObjectGetPropertyDataSize(deviceID, &address, 0, nil, &size) == noErr else { return nil }
+        var name: Unmanaged<CFString>?
+        let status = withUnsafeMutablePointer(to: &name) { ptr in
+            AudioObjectGetPropertyData(deviceID, &address, 0, nil, &size, ptr)
+        }
+        guard status == noErr, let cf = name?.takeUnretainedValue() else { return nil }
+        return cf as String
+    }
+
     private func removeListener() {
         guard let block = listenerBlock, observedDevice != 0 else { return }
         var address = AudioObjectPropertyAddress(
diff --git a/SessionFlow/Services/SessionAudioService.swift b/SessionFlow/Services/SessionAudioService.swift
index 6b0c42a..f07f54b 100644
--- a/SessionFlow/Services/SessionAudioService.swift
+++ b/SessionFlow/Services/SessionAudioService.swift
@@ -21,6 +21,7 @@ class SessionAudioService: ObservableObject {
 
     let micMonitor = MicrophoneMonitor()
     private var micCancellable: AnyCancellable?
+    private var sharedDeviceCancellable: AnyCancellable?
 
     // MARK: - Audio engine
 
@@ -85,12 +86,16 @@ class SessionAudioService: ObservableObject {
         micCancellable = micMonitor.$isMicActive
             .receive(on: DispatchQueue.main)
             .sink { [weak self] _ in self?.applyMuteState() }
+        sharedDeviceCancellable = micMonitor.$inputOutputSharedDevice
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in self?.applyMuteState() }
     }
 
     // MARK: - Mute Logic
 
     private func applyMuteState() {
-        let shouldMute = muteEnabled || (micAwareEnabled && micMonitor.isMicActive)
+        let micAwareActive = micAwareEnabled && micMonitor.isMicActive && !micMonitor.inputOutputSharedDevice
+        let shouldMute = muteEnabled || micAwareActive
         guard shouldMute != isMuted else { return }
         isMuted = shouldMute
         if isMuted { muteAmbient() } else if shouldBePlayingAmbient { resumeAmbient() }
diff --git a/SessionFlow/Views/AppSettingsView.swift b/SessionFlow/Views/AppSettingsView.swift
index f494042..6683898 100644
--- a/SessionFlow/Views/AppSettingsView.swift
+++ b/SessionFlow/Views/AppSettingsView.swift
@@ -589,9 +589,19 @@ struct AppSettingsView: View {
                             }
                         ))
                         .font(.system(size: 14, weight: .medium))
+                        .disabled(sessionAudioService.micMonitor.inputOutputSharedDevice)
                     }
 
-                    if sessionAwarenessService.config.micAwareEnabled {
+                    if sessionAudioService.micMonitor.inputOutputSharedDevice {
+                        HStack(spacing: 6) {
+                            Image(systemName: "exclamationmark.triangle.fill")
+                                .font(.system(size: 11))
+                                .foregroundColor(.orange)
+                            Text("Mic Aware is unavailable — your input and output both use \"\(sessionAudioService.micMonitor.sharedDeviceName ?? "the same device")\", which causes false mic activation during audio playback. Use a separate mic or change your output device.")
+                                .font(.caption)
+                                .foregroundColor(.secondary)
+                        }
+                    } else if sessionAwarenessService.config.micAwareEnabled {
                         Text("Auto-mutes while your microphone is in use.")
                             .font(.caption)
                             .foregroundColor(.secondary)
diff --git a/SessionFlow/Views/ProductivityCard.swift b/SessionFlow/Views/ProductivityCard.swift
index b523323..4c97118 100644
--- a/SessionFlow/Views/ProductivityCard.swift
+++ b/SessionFlow/Views/ProductivityCard.swift
@@ -260,6 +260,7 @@ struct ProductivityCard: View {
                         .foregroundColor(.white.opacity(count > 0 ? 0.9 : 0.3))
                 }
                 .frame(maxWidth: .infinity)
+                .help(rating.label)
             }
 
             // Unrated count
@@ -272,6 +273,7 @@ struct ProductivityCard: View {
                     .foregroundColor(.white.opacity(unratedCount > 0 ? 0.6 : 0.3))
             }
             .frame(maxWidth: .infinity)
+            .help("Unrated")
         }
     }
 
@@ -604,6 +606,7 @@ struct MonthlyStatsView: View {
                         .font(.system(size: 14, weight: .medium, design: .monospaced))
                         .foregroundColor(count > 0 ? .primary : .secondary.opacity(0.4))
                 }
+                .help(rating.label)
             }
 
             Spacer()
@@ -617,6 +620,7 @@ struct MonthlyStatsView: View {
                     .font(.system(size: 14, weight: .medium, design: .monospaced))
                     .foregroundColor(unrated > 0 ? .primary.opacity(0.6) : .secondary.opacity(0.4))
             }
+            .help("Unrated")
 
             Divider().frame(height: 18)
 
diff --git a/SessionFlow/Views/SharedAwarenessComponents.swift b/SessionFlow/Views/SharedAwarenessComponents.swift
index 222cbcd..663635e 100644
--- a/SessionFlow/Views/SharedAwarenessComponents.swift
+++ b/SessionFlow/Views/SharedAwarenessComponents.swift
@@ -94,10 +94,13 @@ struct AwarenessSkipSessionButton: View {
 
 struct AwarenessMuteButton: View {
     @ObservedObject var audioService: SessionAudioService
+    @EnvironmentObject var awarenessService: SessionAwarenessService
 
     var body: some View {
         Button {
-            audioService.toggleMute()
+            let newValue = !audioService.muteEnabled
+            audioService.muteEnabled = newValue
+            awarenessService.config.muteEnabled = newValue
         } label: {
             iconView
                 .frame(width: 32, height: 32)
diff --git a/SessionFlow/Views/TimelineView.swift b/SessionFlow/Views/TimelineView.swift
index 35cd5ac..10b1cdc 100644
--- a/SessionFlow/Views/TimelineView.swift
+++ b/SessionFlow/Views/TimelineView.swift
@@ -2072,6 +2072,7 @@ extension TimelineView {
                     .font(.system(size: 7, weight: .bold))
                     .foregroundColor(color)
             )
+            .help(rating.label)
     }
 
     private func feedbackPopoverContent(for slot: BusyTimeSlot, existingRating: SessionRating?) -> some View {
@@ -2083,7 +2084,11 @@ extension TimelineView {
             HStack(spacing: 8) {
                 ForEach(SessionRating.allCases, id: \.rawValue) { rating in
                     Button {
-                        calendarService.setFeedbackTag(eventId: slot.id, rating: rating)
+                        if existingRating == rating {
+                            calendarService.clearFeedbackTag(eventId: slot.id)
+                        } else {
+                            calendarService.setFeedbackTag(eventId: slot.id, rating: rating)
+                        }
                         Task { await calendarService.fetchEvents(for: selectedDate) }
                         feedbackPopoverEventId = nil
                     } label: {