diff --git a/qTox.desktop b/qTox.desktop
index afd74b440..298a11771 100644
--- a/qTox.desktop
+++ b/qTox.desktop
@@ -9,4 +9,4 @@ Exec=qtox
 Icon=qtox
 Categories=InstantMessaging;;AudioVideo;Network;
 Terminal=false
-MimeType=x-scheme-handler/tox;
+MimeType=x-scheme-handler/tox;application/x-tox;
diff --git a/src/core.cpp b/src/core.cpp
index 27d0afc61..436c9d5c4 100644
--- a/src/core.cpp
+++ b/src/core.cpp
@@ -47,6 +47,8 @@ QList<ToxFile> Core::fileRecvQueue;
 Core::Core(Camera* cam, QThread *coreThread, QString loadPath) :
     tox(nullptr), camera(cam), loadPath(loadPath)
 {
+    qDebug() << "Core: loading Tox from" << loadPath;
+
     videobuf = new uint8_t[videobufsize];
     videoBusyness=0;
 
@@ -590,7 +592,7 @@ void Core::onFileControlCallback(Tox* tox, int32_t friendnumber, uint8_t receive
 
         uint64_t resumePos = *reinterpret_cast<const uint64_t*>(data);
 
-        if (resumePos >= file->filesize)
+        if (resumePos >= (unsigned)file->filesize)
         {
             qWarning() << "Core::onFileControlCallback: invalid resume position";
             tox_file_send_control(tox, file->friendId, 0, file->fileNum, TOX_FILECONTROL_KILL, nullptr, 0); // don't sure about it
@@ -1218,8 +1220,15 @@ void Core::saveConfiguration(const QString& path)
     }
 }
 
-void Core::switchConfiguration(QString profile)
+void Core::switchConfiguration(const QString& profile)
 {
+    if (profile.isEmpty())
+    {
+        qWarning() << "Core: got null profile to switch to, not switching";
+        return;
+    }
+    else
+        qDebug() << "Core: switching from" << Settings::getInstance().getCurrentProfile() << "to" << profile;
     saveConfiguration();
     
     toxTimer->stop();
@@ -1231,7 +1240,7 @@ void Core::switchConfiguration(QString profile)
         tox = nullptr;
     }
     emit selfAvatarChanged(QPixmap(":/img/contact_dark.png"));
-    Widget::getInstance()->clearContactsList(); // we need this to block, so no signals for us
+    emit blockingClearContacts(); // we need this to block, but signals are required for thread safety
     
     loadPath = QDir(Settings::getSettingsDirPath()).filePath(profile + TOX_EXT);
     Settings::getInstance().setCurrentProfile(profile); 
diff --git a/src/core.h b/src/core.h
index 2e928c9a4..7e8dc632e 100644
--- a/src/core.h
+++ b/src/core.h
@@ -53,7 +53,6 @@ public:
 
     void saveConfiguration();
     void saveConfiguration(const QString& path);
-    void switchConfiguration(QString profile);
     
     QString getIDString();
     
@@ -64,10 +63,13 @@ public:
     void increaseVideoBusyness();
     void decreaseVideoBusyness();
 
+    bool anyActiveCalls();
+
 public slots:
     void start();
     void process();
     void bootstrapDht();
+    void switchConfiguration(const QString& profile);
 
     void acceptFriendRequest(const QString& userId);
     void requestFriendship(const QString& friendAddress, const QString& message);
@@ -112,6 +114,7 @@ public slots:
 signals:
     void connected();
     void disconnected();
+    void blockingClearContacts();
 
     void friendRequestReceived(const QString& userId, const QString& message);
     void friendMessageReceived(int friendId, const QString& message, bool isAction);
diff --git a/src/coreav.cpp b/src/coreav.cpp
index b7aae0103..516d08833 100644
--- a/src/coreav.cpp
+++ b/src/coreav.cpp
@@ -28,6 +28,14 @@ ALCdevice* Core::alOutDev, *Core::alInDev;
 ALCcontext* Core::alContext;
 ALuint Core::alMainSource;
 
+bool Core::anyActiveCalls()
+{
+    for (auto& call : calls)
+        if (call.active)
+            return true;
+    return false;
+}
+
 void Core::prepareCall(int friendId, int callId, ToxAv* toxav, bool videoEnabled)
 {
     qDebug() << QString("Core: preparing call %1").arg(callId);
diff --git a/src/widget/camera.cpp b/src/widget/camera.cpp
index 5bf07e6df..b652d7033 100644
--- a/src/widget/camera.cpp
+++ b/src/widget/camera.cpp
@@ -34,7 +34,6 @@ Camera::Camera()
 
     connect(workerThread, &QThread::started, worker, &CameraWorker::onStart);
     connect(workerThread, &QThread::finished, worker, &CameraWorker::deleteLater);
-    connect(workerThread, &QThread::deleteLater, worker, &CameraWorker::deleteLater);
     connect(worker, &CameraWorker::started, this, &Camera::onWorkerStarted);
     connect(worker, &CameraWorker::newFrameAvailable, this, &Camera::onNewFrameAvailable);
     connect(worker, &CameraWorker::resProbingFinished, this, &Camera::onResProbingFinished);
diff --git a/src/widget/form/settings/identityform.cpp b/src/widget/form/settings/identityform.cpp
index c0853f958..d61a9fb18 100644
--- a/src/widget/form/settings/identityform.cpp
+++ b/src/widget/form/settings/identityform.cpp
@@ -108,7 +108,15 @@ void IdentityForm::setStatusMessage(const QString &msg)
 
 void IdentityForm::onLoadClicked()
 {
-    Core::getInstance()->switchConfiguration(bodyUI->profiles->currentText());
+    if (bodyUI->profiles->currentText() != Settings::getInstance().getCurrentProfile())
+    {
+        if (Core::getInstance()->anyActiveCalls())
+            QMessageBox::warning(this, tr("Call active", "popup title"),
+                tr("You can't switch profiles while a call is active!", "popup text"));
+        else
+            emit Widget::getInstance()->changeProfile(bodyUI->profiles->currentText());
+            // I think by directly calling the function, I may have been causing thread issues
+    }
 }
 
 void IdentityForm::onRenameClicked()
@@ -132,7 +140,8 @@ void IdentityForm::onExportClicked()
     QString path = QFileDialog::getSaveFileName(this, tr("Export profile", "save dialog title"),
                     QDir::home().filePath(current), 
                     tr("Tox save file (*.tox)", "save dialog filter"));
-    QFile::copy(QDir(Settings::getSettingsDirPath()).filePath(current), path);
+    if (!path.isEmpty())
+        QFile::copy(QDir(Settings::getSettingsDirPath()).filePath(current), path);
 }
 
 void IdentityForm::onDeleteClicked()
@@ -157,6 +166,8 @@ void IdentityForm::onDeleteClicked()
 void IdentityForm::onImportClicked()
 {
     QString path = QFileDialog::getOpenFileName(this, tr("Import profile", "import dialog title"), QDir::homePath(), tr("Tox save file (*.tox)", "import dialog filter"));
+    if (path.isEmpty())
+        return;
     QFileInfo info(path);
     QString profile = info.completeBaseName();
     QString profilePath = QDir(Settings::getSettingsDirPath()).filePath(profile + Core::TOX_EXT);
diff --git a/src/widget/widget.cpp b/src/widget/widget.cpp
index b310627c0..18231d2ac 100644
--- a/src/widget/widget.cpp
+++ b/src/widget/widget.cpp
@@ -146,6 +146,7 @@ Widget::Widget(QWidget *parent)
     connect(core, &Core::groupNamelistChanged, this, &Widget::onGroupNamelistChanged);
     connect(core, &Core::emptyGroupCreated, this, &Widget::onEmptyGroupCreated);
     connect(core, &Core::avInvite, this, &Widget::playRingtone);
+    connect(core, &Core::blockingClearContacts, this, &Widget::clearContactsList, Qt::BlockingQueuedConnection);
 
     connect(core, SIGNAL(messageSentResult(int,QString,int)), this, SLOT(onMessageSendResult(int,QString,int)));
     connect(core, SIGNAL(groupSentResult(int,QString,int)), this, SLOT(onGroupSendResult(int,QString,int)));
@@ -153,6 +154,7 @@ Widget::Widget(QWidget *parent)
     connect(this, &Widget::statusSet, core, &Core::setStatus);
     connect(this, &Widget::friendRequested, core, &Core::requestFriendship);
     connect(this, &Widget::friendRequestAccepted, core, &Core::acceptFriendRequest);
+    connect(this, &Widget::changeProfile, core, &Core::switchConfiguration);
 
     connect(ui->addButton, SIGNAL(clicked()), this, SLOT(onAddClicked()));
     connect(ui->groupButton, SIGNAL(clicked()), this, SLOT(onGroupClicked()));
diff --git a/src/widget/widget.h b/src/widget/widget.h
index 923d077df..572ba1922 100644
--- a/src/widget/widget.h
+++ b/src/widget/widget.h
@@ -69,6 +69,7 @@ signals:
     void statusSelected(Status status);
     void usernameChanged(const QString& username);
     void statusMessageChanged(const QString& statusMessage);
+    void changeProfile(const QString& profile);
 
 private slots:
     void onConnected();