diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/scheduledposts/ScheduledPostNotifier.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/scheduledposts/ScheduledPostNotifier.kt
index 7bbb64c27..37f57c45e 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/scheduledposts/ScheduledPostNotifier.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/scheduledposts/ScheduledPostNotifier.kt
@@ -39,6 +39,10 @@ import com.vitorpamplona.amethyst.ui.stringRes
  * now guards against; the notification closes the loop.
  */
 object ScheduledPostNotifier {
+    // @Volatile so the channel reference is visible across the WorkManager IO
+    // thread pool — two workers firing in the same window can race on
+    // ensureChannel. createNotificationChannel itself is idempotent.
+    @Volatile
     private var channel: NotificationChannel? = null
     private const val SCHEDULED_POST_NOT_ID_BASE = 0x70000
 
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/scheduledposts/ScheduledPostsScreen.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/scheduledposts/ScheduledPostsScreen.kt
index a034d52d8..32c5c617f 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/scheduledposts/ScheduledPostsScreen.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/scheduledposts/ScheduledPostsScreen.kt
@@ -78,6 +78,7 @@ import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.compositeOver
 import androidx.compose.ui.platform.LocalClipboardManager
+import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.semantics.semantics
@@ -111,7 +112,6 @@ import java.time.LocalDate
 import java.time.ZoneId
 import java.time.format.DateTimeFormatter
 import java.time.format.FormatStyle
-import java.util.Locale
 
 @OptIn(ExperimentalMaterial3Api::class, ExperimentalFoundationApi::class)
 @Composable
@@ -460,8 +460,9 @@ private fun ScheduledPostCardExpandedPanel(
 
 @Composable
 private fun SectionLabel(text: String) {
+    val locale = LocalConfiguration.current.locales[0]
     Text(
-        text = text.uppercase(Locale.getDefault()),
+        text = text.uppercase(locale),
         style = MaterialTheme.typography.labelSmall,
         color = MaterialTheme.colorScheme.onSurfaceVariant,
         modifier = Modifier.padding(bottom = 4.dp),
diff --git a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/client/pool/PoolEventOutbox.kt b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/client/pool/PoolEventOutbox.kt
index 4ff97faed..d934b4618 100644
--- a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/client/pool/PoolEventOutbox.kt
+++ b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/client/pool/PoolEventOutbox.kt
@@ -31,6 +31,11 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.update
 
 class PoolEventOutbox {
+    // @Volatile so the polling path (INostrClient.pendingPublishRelaysFor)
+    // sees current state from threads that didn't write the map. Mutations
+    // still happen on NostrClient's IO scope; this only closes the
+    // visibility gap for cross-thread readers.
+    @Volatile
     private var eventOutbox = mapOf<HexKey, PoolEventOutboxState>()
     val relays = MutableStateFlow(setOf<NormalizedRelayUrl>())
 
diff --git a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/client/pool/PoolEventOutboxState.kt b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/client/pool/PoolEventOutboxState.kt
index f75f3aa6a..28fb62967 100644
--- a/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/client/pool/PoolEventOutboxState.kt
+++ b/quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/relay/client/pool/PoolEventOutboxState.kt
@@ -26,7 +26,7 @@ import com.vitorpamplona.quartz.utils.TimeUtils
 
 class PoolEventOutboxState(
     val event: Event,
-    var relaysRemaining: Set<NormalizedRelayUrl>,
+    @Volatile var relaysRemaining: Set<NormalizedRelayUrl>,
 ) {
     private var failures = mapOf<NormalizedRelayUrl, Tries>()