diff --git a/build-system/xcode_version b/build-system/xcode_version
index 1c7134df6c..a6e5b12f92 100644
--- a/build-system/xcode_version
+++ b/build-system/xcode_version
@@ -1 +1 @@
-11.4
+11.4.1
diff --git a/submodules/Postbox/Sources/Postbox.swift b/submodules/Postbox/Sources/Postbox.swift
index 16d2f01690..f1fa88e85b 100644
--- a/submodules/Postbox/Sources/Postbox.swift
+++ b/submodules/Postbox/Sources/Postbox.swift
@@ -2877,6 +2877,7 @@ public final class Postbox {
             let disposable = MetaDisposable()
             self.queue.async {
                 disposable.set(self.viewTracker.unsentMessageIdsViewSignal().start(next: { view in
+                    postboxLog("unsentMessageIdsView contents: \(view.ids)")
                     subscriber.putNext(view)
                 }))
             }
diff --git a/submodules/Postbox/Sources/UnsentMessageHistoryView.swift b/submodules/Postbox/Sources/UnsentMessageHistoryView.swift
index 6769deb967..f0cc140903 100644
--- a/submodules/Postbox/Sources/UnsentMessageHistoryView.swift
+++ b/submodules/Postbox/Sources/UnsentMessageHistoryView.swift
@@ -9,6 +9,7 @@ final class UnsentMessageHistoryView {
     
     func refreshDueToExternalTransaction(fetchUnsentMessageIds: () -> [MessageId]) -> Bool {
         let ids = Set(fetchUnsentMessageIds())
+        postboxLog("UnsentMessageHistoryView: refreshDueToExternalTransaction: \(ids)")
         if ids != self.ids {
             self.ids = ids
             return true
@@ -20,6 +21,7 @@ final class UnsentMessageHistoryView {
     func replay(_ operations: [IntermediateMessageHistoryUnsentOperation]) -> Bool {
         var updated = false
         for operation in operations {
+            postboxLog("UnsentMessageHistoryView: operation: \(operation)")
             switch operation {
                 case let .Insert(id):
                     if !self.ids.contains(id) {
diff --git a/submodules/Postbox/Sources/ViewTracker.swift b/submodules/Postbox/Sources/ViewTracker.swift
index 14483b6760..6b7de365ee 100644
--- a/submodules/Postbox/Sources/ViewTracker.swift
+++ b/submodules/Postbox/Sources/ViewTracker.swift
@@ -546,6 +546,7 @@ final class ViewTracker {
         return Signal { subscriber in
             let disposable = MetaDisposable()
             self.queue.async {
+                postboxLog("unsentMessageIdsViewSignal started with \(self.unsentMessageView.ids)")
                 subscriber.putNext(UnsentMessageIdsView(self.unsentMessageView.ids))
                 
                 let pipe = ValuePipe<UnsentMessageIdsView>()