diff --git a/setup.cfg b/setup.cfg
index 58743217..1a079d3a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -33,7 +33,7 @@ setup_requires =
 install_requires =
   appdirs
   paramiko
-  pyqt5
+  pyqt5 < 5.15
   peewee
   python-dateutil
   apscheduler
diff --git a/src/vorta/application.py b/src/vorta/application.py
index 76fada6b..fedd92f3 100644
--- a/src/vorta/application.py
+++ b/src/vorta/application.py
@@ -2,16 +2,18 @@ import os
 import sys
 import sip
 from PyQt5 import QtCore
+from PyQt5.QtWidgets import QMessageBox
+
+from vorta.borg.create import BorgCreateThread
 from vorta.borg.version import BorgVersionThread
 from vorta.config import STATE_DIR
-from .borg.create import BorgCreateThread
-from .i18n import init_translations, translate
-from .models import BackupProfileModel, SettingsModel
-from .qt_single_application import QtSingleApplication
-from .scheduler import VortaScheduler
-from .tray_menu import TrayMenu
-from .utils import borg_compat, parse_args
-from .views.main_window import MainWindow
+from vorta.i18n import init_translations, translate
+from vorta.models import BackupProfileModel, SettingsModel
+from vorta.qt_single_application import QtSingleApplication
+from vorta.scheduler import VortaScheduler
+from vorta.tray_menu import TrayMenu
+from vorta.utils import borg_compat, parse_args
+from vorta.views.main_window import MainWindow
 
 APP_ID = os.path.join(STATE_DIR, "socket")
 
@@ -110,13 +112,29 @@ class VortaApp(QtSingleApplication):
     def set_borg_details_action(self):
         params = BorgVersionThread.prepare()
         if not params['ok']:
+            self._alert_missing_borg()
             return
         thread = BorgVersionThread(params['cmd'], params, parent=self)
         thread.result.connect(self.set_borg_details_result)
         thread.start()
 
     def set_borg_details_result(self, result):
-        borg_compat.set_version(result['data']['version'], result['data']['path'])
-        if self._main_window_exists():
-            self.main_window.miscTab.set_borg_details(borg_compat.version, borg_compat.path)
-            self.main_window.repoTab.toggle_available_compression()
+        """
+        Receive result from BorgVersionThread. If MainWindow is open, set the version in misc tab.
+        If no valid version was found, display an error.
+        """
+        if 'version' in result['data']:
+            borg_compat.set_version(result['data']['version'], result['data']['path'])
+            if self._main_window_exists():
+                self.main_window.miscTab.set_borg_details(borg_compat.version, borg_compat.path)
+                self.main_window.repoTab.toggle_available_compression()
+        else:
+            self._alert_missing_borg()
+
+    def _alert_missing_borg(self):
+        msg = QMessageBox()
+        msg.setIcon(QMessageBox.Critical)
+        msg.setText(self.tr("No Borg Binary Found"))
+        msg.setInformativeText(self.tr("Vorta was unable to locate a usable Borg Backup binary."))
+        msg.setStandardButtons(QMessageBox.Ok)
+        msg.exec_()
diff --git a/src/vorta/assets/UI/sourcetab.ui b/src/vorta/assets/UI/sourcetab.ui
index 2969e763..a5bc6b91 100644
--- a/src/vorta/assets/UI/sourcetab.ui
+++ b/src/vorta/assets/UI/sourcetab.ui
@@ -100,7 +100,7 @@
         <string/>
        </property>
        <property name="placeholderText">
-        <string>**/.DS_Store</string>
+        <string>E.g. **/.DS_Store</string>
        </property>
       </widget>
      </item>
@@ -113,7 +113,7 @@
         </sizepolicy>
        </property>
        <property name="placeholderText">
-        <string>.nobackup</string>
+        <string>E.g. CACHE or .nobackup</string>
        </property>
       </widget>
      </item>
diff --git a/src/vorta/models.py b/src/vorta/models.py
index 1aa4e550..c38c6cab 100644
--- a/src/vorta/models.py
+++ b/src/vorta/models.py
@@ -13,7 +13,7 @@ import peewee as pw
 from playhouse.migrate import SqliteMigrator, migrate
 
 from vorta.i18n import trans_late
-from vorta.utils import is_system_tray_available, slugify
+from vorta.utils import slugify
 
 SCHEMA_VERSION = 14
 
@@ -346,8 +346,6 @@ def init_db(con=None):
     # Create missing settings and update labels. Leave setting values untouched.
     for setting in get_misc_settings():
         s, created = SettingsModel.get_or_create(key=setting['key'], defaults=setting)
-        if created and setting['key'] == "enable_notifications_success":
-            s.value = not bool(is_system_tray_available())
         s.label = setting['label']
         s.save()
 
diff --git a/tests/test_source.py b/tests/test_source.py
index b0a31b68..6360f4d3 100644
--- a/tests/test_source.py
+++ b/tests/test_source.py
@@ -12,4 +12,4 @@ def test_add_folder(qapp, qtbot, tmpdir, monkeypatch, choose_file_dialog):
     tab = main.sourceTab
 
     qtbot.mouseClick(tab.sourceAddFolder, QtCore.Qt.LeftButton)
-    qtbot.waitUntil(lambda: tab.sourceFilesWidget.count() == 2)
+    qtbot.waitUntil(lambda: tab.sourceFilesWidget.count() == 2, timeout=5000)