diff --git a/ArtNet/artnet_manager.py b/ArtNet/artnet_manager.py
index 77f284f..6bd67f3 100644
--- a/ArtNet/artnet_manager.py
+++ b/ArtNet/artnet_manager.py
@@ -320,7 +320,8 @@ class ArtNetManager:
         #image_db_result = self.db_connection.get_art_by_path(self.all_images[self.curr_image_index])
         s = self.all_images[self.curr_image_index].split(os.path.sep)
         if image_db_result is not None:
-            image_title = image_db_result["title"] if len(image_db_result["title"]) > 0 else "-Title Unknown-"
+            image_title = image_db_result["title"] if isinstance(image_db_result["title"], str) and \
+                                                      len(image_db_result["title"]) > 0 else self.window.UNKNOWN_TITLE
             image_author = self.db_connection.get_authors_of_art_by_ID(image_db_result["ID"])
             image_link = image_db_result["link"]
             art_ID = image_db_result["ID"]
diff --git a/ArtNet/db/db_adapter.py b/ArtNet/db/db_adapter.py
index da2b96d..223635e 100644
--- a/ArtNet/db/db_adapter.py
+++ b/ArtNet/db/db_adapter.py
@@ -21,9 +21,9 @@ class DBAdapter:
         Updates or saves the given image data to the DB
         :param ID:
         :param title:
-        :param authors:
+        :param authors: list of presences List[Tuple[str, str]]
         :param path:
-        :param tags:
+        :param tags:  list of tag names List[str]
         :param link:
         :param md5_hash: md5 hash as a hex digest
         :return:
@@ -549,6 +549,7 @@ class DBAdapter:
         :return:
         """
         name = name.strip().lower()
+        implications = [self.get_tag_ID(x) for x in implications]
         d = {
             "id": tag_id,
             "name": name,
@@ -572,7 +573,7 @@ class DBAdapter:
                     self.remove_alias_by_ID(tag_id, old_alias)
 
         if implications is not None:
-            old_implicants = self.get_tag_implications(name)
+            old_implicants = self.get_tag_implications_by_ID(tag_id)
             for implicant in implications:
                 if implicant in old_implicants:  # is this already set?
                     continue
diff --git a/ArtNet/gui/window.py b/ArtNet/gui/window.py
index 71503ca..34e7973 100644
--- a/ArtNet/gui/window.py
+++ b/ArtNet/gui/window.py
@@ -19,6 +19,9 @@ from ArtNet.web.link_generator import LinkGenerator
 
 class Window(QtWidgets.QMainWindow):
 
+    UNKNOWN_TITLE = "-Title Unknown-"
+    UNKNOWN_PRESENCE = "(Not in Database)"
+
     def __init__(self, main):
         super(Window, self).__init__()
 
@@ -130,7 +133,7 @@ class Window(QtWidgets.QMainWindow):
         :return:
         """
         new_title = self.curr_image_title
-        if new_title == self.curr_file_name or len(new_title) == 0:
+        if new_title == self.curr_file_name or len(new_title) == 0 or new_title == Window.UNKNOWN_TITLE:
             new_title = None
         image_data = {
             "ID": self.curr_art_id,
@@ -143,7 +146,7 @@ class Window(QtWidgets.QMainWindow):
         }
 
         for presence in self.curr_presences:
-            if presence[-1] == "(Not in Database)":
+            if presence[-1] == Window.UNKNOWN_PRESENCE:
                 msg = QtWidgets.QMessageBox()
                 msg.setWindowTitle("Invalid Presence Domain")
                 msg.setInformativeText("You've tried to save with a not working presence entry! " +
@@ -302,10 +305,10 @@ class Window(QtWidgets.QMainWindow):
         """
         if len(presences) > 1:
             for name, domain in presences:
-                if domain == "(Not in Database)":
+                if domain == Window.UNKNOWN_PRESENCE:
                     presences.remove((name, domain))
         elif len(presences) == 0:
-            presences = [(self.curr_art_path.split("/")[0], "(Not in Database)")]
+            presences = [(self.curr_art_path.split("/")[0], Window.UNKNOWN_PRESENCE)]
         self.curr_presences = presences
 
         if self.curr_presences is not None:
@@ -529,7 +532,7 @@ class Window(QtWidgets.QMainWindow):
             self.ui.image_label.setMovie(self.__pixmap)
             self.__pixmap.start()
             self.__pixmap.frameChanged.connect(self.on_movie_frame_changed)
-        elif file_ending in ["webm"]:
+        elif file_ending in ["webm", "mp4", "mov"]:
             self.__showing_video = True
             self.__video = QVideoWidget()
             self.__player = QtMultimedia.QMediaPlayer(None, QtMultimedia.QMediaPlayer.VideoSurface)