diff --git a/ChangeLog.txt b/ChangeLog.txt
index 5aaa6deff..6b9c5a239 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -12,6 +12,7 @@ Default Qt Client
 - Fixed gender changed from female to male when migrating to 5.17 release
 - Fixed sound events disabled when migrating to 5.17 release
 - Fixed language not set at first start
+- All size converted to local format
 Android Client
 -
 iOS Client
diff --git a/Client/qtTeamTalk/changestatusdlg.cpp b/Client/qtTeamTalk/changestatusdlg.cpp
index 4d313a7f4..a42433ec3 100644
--- a/Client/qtTeamTalk/changestatusdlg.cpp
+++ b/Client/qtTeamTalk/changestatusdlg.cpp
@@ -66,6 +66,9 @@ void ChangeStatusDlg::slotAccepted()
     case STATUSMODE_QUESTION :
         m_user.nStatusMode |= STATUSMODE_QUESTION;
     break;
+    default :
+        Q_ASSERT(false /* this status mode is not implemented*/);
+        break;
     }
 
     ttSettings->setValue(SETTINGS_GENERAL_STATUSMESSAGE, ui.msgEdit->text());
diff --git a/Client/qtTeamTalk/chattextedit.cpp b/Client/qtTeamTalk/chattextedit.cpp
index f6cac4242..14e8c9635 100644
--- a/Client/qtTeamTalk/chattextedit.cpp
+++ b/Client/qtTeamTalk/chattextedit.cpp
@@ -215,7 +215,7 @@ void ChatTextEdit::joinedChannel(int channelid)
     appendPlainText(line);
 
     //show disk quota in red
-    line = tr("Disk quota: %1 KBytes").arg(chan.nDiskQuota/1024);
+    line = tr("Disk quota: %1").arg(getFormattedSize(chan.nDiskQuota));
     format.setForeground(QBrush(Qt::darkRed));
     cursor.setCharFormat(format);
     setTextCursor(cursor);
diff --git a/Client/qtTeamTalk/filesmodel.cpp b/Client/qtTeamTalk/filesmodel.cpp
index ad657075f..8251e9411 100644
--- a/Client/qtTeamTalk/filesmodel.cpp
+++ b/Client/qtTeamTalk/filesmodel.cpp
@@ -74,7 +74,7 @@ QVariant FilesModel::data ( const QModelIndex & index, int role /*= Qt::DisplayR
         case COLUMN_INDEX_NAME :
             return _Q(m_files[index.row()].szFileName);
         case COLUMN_INDEX_SIZE :
-            return getFormattedFileSize(m_files[index.row()].nFileSize);
+            return getFormattedSize(m_files[index.row()].nFileSize);
         case COLUMN_INDEX_OWNER :
             return _Q(m_files[index.row()].szUsername);
         case COLUMN_INDEX_UPLOADED :
diff --git a/Client/qtTeamTalk/filetransferdlg.cpp b/Client/qtTeamTalk/filetransferdlg.cpp
index 65b13a1d4..40d174d70 100644
--- a/Client/qtTeamTalk/filetransferdlg.cpp
+++ b/Client/qtTeamTalk/filetransferdlg.cpp
@@ -80,8 +80,8 @@ void FileTransferDlg::updateFileTransfer(const FileTransfer& transfer)
     setWindowTitle(_Q(transfer.szRemoteFileName));
     ui.filenameLabel->setText(_Q(transfer.szRemoteFileName));
     ui.filenameLabel->setAccessibleName(QString("%1 %2").arg(ui.label->text()).arg(_Q(transfer.szRemoteFileName)));
-    ui.filesizeLabel->setText(getFormattedFileSize(transfer.nFileSize));
-    ui.filesizeLabel->setAccessibleName(QString("%1 %2").arg(ui.label_2->text()).arg(getFormattedFileSize(transfer.nFileSize)));
+    ui.filesizeLabel->setText(getFormattedSize(transfer.nFileSize));
+    ui.filesizeLabel->setAccessibleName(QString("%1 %2").arg(ui.label_2->text()).arg(getFormattedSize(transfer.nFileSize)));
     double percent = 100.0;
     if(transfer.nFileSize)
         percent = transfer.nTransferred * 100 / transfer.nFileSize;
diff --git a/Client/qtTeamTalk/mainwindow.cpp b/Client/qtTeamTalk/mainwindow.cpp
index afe3422b9..0dae8eb1b 100644
--- a/Client/qtTeamTalk/mainwindow.cpp
+++ b/Client/qtTeamTalk/mainwindow.cpp
@@ -1295,8 +1295,8 @@ void MainWindow::clienteventCmdFileNew(const RemoteFile& file)
         User user;
         TT_GetUserByUsername(ttInst, file.szUsername, &user);
         QString name = m_host.username != _Q(file.szUsername)?getDisplayName(user):tr("You");
-        addStatusMsg(STATUSBAR_FILE_ADD, UtilUI::getStatusBarMessage(SETTINGS_STATUSBARMSG_FILE_ADDED, {{"{filename}", _Q(file.szFileName)}, {"{user}", name}, {"{username}", _Q(user.szUsername)}, {"{filesize}", getFormattedFileSize(file.nFileSize)}}));
-        addTextToSpeechMessage(TTS_FILE_ADD, UtilTTS::getTTSMessage(SETTINGS_TTSMSG_FILE_ADDED, {{"{filename}", _Q(file.szFileName)}, {"{user}", name}, {"{username}", _Q(user.szUsername)}, {"{filesize}", getFormattedFileSize(file.nFileSize)}}));
+        addStatusMsg(STATUSBAR_FILE_ADD, UtilUI::getStatusBarMessage(SETTINGS_STATUSBARMSG_FILE_ADDED, {{"{filename}", _Q(file.szFileName)}, {"{user}", name}, {"{username}", _Q(user.szUsername)}, {"{filesize}", getFormattedSize(file.nFileSize)}}));
+        addTextToSpeechMessage(TTS_FILE_ADD, UtilTTS::getTTSMessage(SETTINGS_TTSMSG_FILE_ADDED, {{"{filename}", _Q(file.szFileName)}, {"{user}", name}, {"{username}", _Q(user.szUsername)}, {"{filesize}", getFormattedSize(file.nFileSize)}}));
     }
 }
 
@@ -2309,6 +2309,10 @@ void MainWindow::hotkeyToggle(HotKeyID id, bool active)
 {
     switch(id)
     {
+    case HOTKEY_NONE :
+    case HOTKEY_NEXT_UNUSED :
+        Q_ASSERT(false /* these hotkey are not implemented*/);
+        break;
     case HOTKEY_PUSHTOTALK :
         pttHotKey(active);
         break;
@@ -2419,7 +2423,7 @@ void MainWindow::timerEvent(QTimerEvent *event)
             int ping = stats.nUdpPingTimeMs;
             m_clientstats = stats;
 
-            QString status = QString("RX: %1KB TX: %2KB").arg(rx / 1024.0, 2, 'f', 2, '0').arg(tx / 1024.0, 2, 'f', 2, '0');
+            QString status = QString("RX: %1 TX: %2").arg(getFormattedSize(rx)).arg(getFormattedSize(tx));
 
             if(ping != -1)
                 m_pinglabel->setText(QString("PING: %1").arg(ping));
diff --git a/Client/qtTeamTalk/preferencesdlg.cpp b/Client/qtTeamTalk/preferencesdlg.cpp
index c3640658d..202045c9c 100644
--- a/Client/qtTeamTalk/preferencesdlg.cpp
+++ b/Client/qtTeamTalk/preferencesdlg.cpp
@@ -844,6 +844,11 @@ void PreferencesDlg::slotSaveChanges()
 
         switch(newsndsys)
         {
+        case SOUNDSYSTEM_NONE :
+        case SOUNDSYSTEM_OPENSLES_ANDROID :
+        case SOUNDSYSTEM_AUDIOUNIT :
+            Q_ASSERT(false /* these sound systems are not supported*/);
+            break;
         case SOUNDSYSTEM_WASAPI:
             ttSettings->setValue(SETTINGS_SOUND_SOUNDSYSTEM, SOUNDSYSTEM_WASAPI);
         break;
diff --git a/Client/qtTeamTalk/serverstatsdlg.cpp b/Client/qtTeamTalk/serverstatsdlg.cpp
index 902b11c6b..a8b978460 100644
--- a/Client/qtTeamTalk/serverstatsdlg.cpp
+++ b/Client/qtTeamTalk/serverstatsdlg.cpp
@@ -17,6 +17,7 @@
 
 #include "serverstatsdlg.h"
 #include "appinfo.h"
+#include "utilui.h"
 
 #include <QTimer>
 
@@ -50,21 +51,21 @@ void ServerStatisticsDlg::slotCmdSuccess(int cmdid)
 
 void ServerStatisticsDlg::slotUpdateStats(const ServerStatistics& stats)
 {
-    ui.totalRXTXLabel->setText(QString(tr("Total RX/TX") + ": %L1 / %L2 " + tr("KBytes"))
-        .arg(stats.nTotalBytesRX/1024)
-        .arg(stats.nTotalBytesTX/1024));
-    ui.voiceRXTXLabel->setText(QString(tr("Voice RX/TX") + ": %L1 / %L2 " + tr("KBytes"))
-        .arg(stats.nVoiceBytesRX/1024)
-        .arg(stats.nVoiceBytesTX/1024));
-    ui.videoRXTXLabel->setText(QString(tr("Video RX/TX") + ": %L1 / %L2 " + tr("KBytes"))
-        .arg(stats.nVideoCaptureBytesRX/1024)
-        .arg(stats.nVideoCaptureBytesTX/1024));
-    ui.mediafileRXTXLabel->setText(QString(tr("Media File RX/TX") + ": %L1 / %L2 " + tr("KBytes"))
-        .arg(stats.nMediaFileBytesRX/1024)
-        .arg(stats.nMediaFileBytesTX/1024));
-    ui.desktopRXTXLabel->setText(QString(tr("Desktop RX/TX") + ": %L1 / %L2 " + tr("KBytes"))
-        .arg(stats.nDesktopBytesRX/1024)
-        .arg(stats.nDesktopBytesTX/1024));
+    ui.totalRXTXLabel->setText(QString(tr("Total RX/TX") + ": %L1 / %L2")
+        .arg(getFormattedSize(stats.nTotalBytesRX))
+        .arg(getFormattedSize(stats.nTotalBytesTX)));
+    ui.voiceRXTXLabel->setText(QString(tr("Voice RX/TX") + ": %L1 / %L2")
+        .arg(getFormattedSize(stats.nVoiceBytesRX))
+        .arg(getFormattedSize(stats.nVoiceBytesTX)));
+    ui.videoRXTXLabel->setText(QString(tr("Video RX/TX") + ": %L1 / %L2")
+        .arg(getFormattedSize(stats.nVideoCaptureBytesRX))
+        .arg(getFormattedSize(stats.nVideoCaptureBytesTX)));
+    ui.mediafileRXTXLabel->setText(QString(tr("Media File RX/TX") + ": %L1 / %L2")
+        .arg(getFormattedSize(stats.nMediaFileBytesRX))
+        .arg(getFormattedSize(stats.nMediaFileBytesTX)));
+    ui.desktopRXTXLabel->setText(QString(tr("Desktop RX/TX") + ": %L1 / %L2")
+        .arg(getFormattedSize(stats.nDesktopBytesRX))
+        .arg(getFormattedSize(stats.nDesktopBytesTX)));
     if(m_lastStats.nUptimeMSec)
     {
         qint64 diff = stats.nUptimeMSec - m_lastStats.nUptimeMSec;
@@ -83,9 +84,9 @@ void ServerStatisticsDlg::slotUpdateStats(const ServerStatistics& stats)
     }
     else
         ui.kbpsLabel->hide();
-    ui.filesRXTXLabel->setText(QString(tr("Files RX/TX") + ": %L1 / %L2 " + tr("KBytes"))
-        .arg(stats.nFilesRx/1024)
-        .arg(stats.nFilesTx/1024));
+    ui.filesRXTXLabel->setText(QString(tr("Files RX/TX") + ": %L1 / %L2")
+        .arg(getFormattedSize(stats.nFilesRx))
+        .arg(getFormattedSize(stats.nFilesTx)));
     ui.usersLabel->setText(QString(tr("Users served") + ": %1").arg(stats.nUsersServed));
     ui.usersPeakLabel->setText(QString(tr("Users peak") + ": %1").arg(stats.nUsersPeak));
 
diff --git a/Client/qtTeamTalk/utilui.cpp b/Client/qtTeamTalk/utilui.cpp
index 6e8630792..649c464cf 100644
--- a/Client/qtTeamTalk/utilui.cpp
+++ b/Client/qtTeamTalk/utilui.cpp
@@ -504,22 +504,22 @@ QString getTimestampFormat()
     return format;
 }
 
-QString getFormattedFileSize(qint64 filesize)
+QString getFormattedSize(qint64 size)
 {
-    QString formattedFileSize;
+    QString formattedSize;
 #if QT_VERSION < QT_VERSION_CHECK(5,10,0)
-    if (filesize >= 1024*1024*1024)
-        formattedFileSize = QString("%1 G").arg(Filesize/(1024*1024*1024));
-    else if (filesize >= 1024*1024)
-        formattedFileSize = QString("%1 M").arg(filesize/(1024*1024));
-    else if (filesize >= 1024)
-        formattedFileSize = QString("%1 K").arg(filesize/1024);
+    if (size >= 1024*1024*1024)
+        formattedSize = QString("%1 G").arg(Filesize/(1024*1024*1024));
+    else if (size >= 1024*1024)
+        formattedSize = QString("%1 M").arg(filesize/(1024*1024));
+    else if (size >= 1024)
+        formattedSize = QString("%1 K").arg(filesize/1024);
     else
-        formattedFileSize = QString("%1").arg(filesize);
+        formattedSize = QString("%1").arg(filesize);
 #else
-    formattedFileSize = QLocale().formattedDataSize(filesize, 1, QLocale::DataSizeSIFormat);
+    formattedSize = QLocale().formattedDataSize(size, 1, QLocale::DataSizeSIFormat);
 #endif
-    return formattedFileSize;
+    return formattedSize;
 }
 
 QString UtilUI::getDefaultValue(const QString& paramKey)
diff --git a/Client/qtTeamTalk/utilui.h b/Client/qtTeamTalk/utilui.h
index 7ad03c9aa..62252ad52 100644
--- a/Client/qtTeamTalk/utilui.h
+++ b/Client/qtTeamTalk/utilui.h
@@ -173,7 +173,7 @@ QString getLanguageDisplayName(const QString &languageCode);
 bool switchLanguage(const QString& language);
 QString getFormattedDateTime(QString originalDateTimeString, QString inputFormat);
 QString getTimestampFormat();
-QString getFormattedFileSize(qint64 filesize);
+QString getFormattedSize(qint64 size);
 
 class UtilUI : public QObject
 {