diff --git a/client/src/main/java/envoy/client/ui/ListViewRefresh.java b/client/src/main/java/envoy/client/ui/ListViewRefresh.java
new file mode 100644
index 0000000..962b18c
--- /dev/null
+++ b/client/src/main/java/envoy/client/ui/ListViewRefresh.java
@@ -0,0 +1,36 @@
+package envoy.client.ui;
+
+import javafx.scene.control.ListCell;
+import javafx.scene.control.ListView;
+
+/**
+ * This is a utility class that provides access to a refreshing mechanism for
+ * elements that were added without notifying the underlying {@link ListView}.
+ * <p>
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>ListViewRefresh.java</strong><br>
+ * Created: <strong>16.07.2020</strong><br>
+ *
+ * @author Leon Hofmeister
+ * @since Envoy Client v0.1-beta
+ */
+public final class ListViewRefresh {
+
+	private ListViewRefresh() {}
+
+	/**
+	 * Deeply refreshes a {@code listview}, meaning it recomputes every single of
+	 * its {@link ListCell}s.
+	 * <p>
+	 * While it does work, it is <b>not the most efficient algorithm</b> possible.
+	 *
+	 * @param toRefresh the listView to refresh
+	 * @param <T>       the type of its {@code listcells}
+	 * @since Envoy Client v0.1-beta
+	 */
+	public static <T> void deepRefresh(ListView<T> toRefresh) {
+		final var items = toRefresh.getItems();
+		toRefresh.setItems(null);
+		toRefresh.setItems(items);
+	}
+}
diff --git a/client/src/main/java/envoy/client/ui/controller/ChatScene.java b/client/src/main/java/envoy/client/ui/controller/ChatScene.java
index 920d93f..83e64fe 100644
--- a/client/src/main/java/envoy/client/ui/controller/ChatScene.java
+++ b/client/src/main/java/envoy/client/ui/controller/ChatScene.java
@@ -31,9 +31,7 @@ import envoy.client.data.audio.AudioRecorder;
 import envoy.client.event.MessageCreationEvent;
 import envoy.client.net.Client;
 import envoy.client.net.WriteProxy;
-import envoy.client.ui.IconUtil;
-import envoy.client.ui.Restorable;
-import envoy.client.ui.SceneContext;
+import envoy.client.ui.*;
 import envoy.client.ui.listcell.ChatControl;
 import envoy.client.ui.listcell.ListCellFactory;
 import envoy.client.ui.listcell.MessageControl;
@@ -144,7 +142,7 @@ public final class ChatScene implements Restorable {
 					} catch (final IOException e1) {
 						logger.log(Level.WARNING, "Could not read current chat: ", e1);
 					}
-					Platform.runLater(() -> { messageList.refresh(); scrollToMessageListEnd(); });
+					Platform.runLater(() -> { ListViewRefresh.deepRefresh(messageList); scrollToMessageListEnd(); });
 				} else chat.incrementUnreadAmount();
 				// Moving chat with most recent unreadMessages to the top
 				Platform.runLater(() -> {
@@ -158,8 +156,9 @@ public final class ChatScene implements Restorable {
 		// Listen to message status changes
 		eventBus.register(MessageStatusChange.class, e -> localDB.getMessage(e.getID()).ifPresent(message -> {
 			message.setStatus(e.get());
-			// Update UI if in current chat
-			if (currentChat != null && message.getSenderID() == currentChat.getRecipient().getID()) Platform.runLater(messageList::refresh);
+			// Update UI if in current chat and the current user was the sender of the
+			// message
+			if (currentChat != null && message.getSenderID() == client.getSender().getID()) Platform.runLater(messageList::refresh);
 		}));
 
 		eventBus.register(GroupMessageStatusChange.class, e -> localDB.getMessage(e.getID()).ifPresent(groupMessage -> {
@@ -176,7 +175,7 @@ public final class ChatScene implements Restorable {
 					.filter(c -> c.getRecipient().getID() == e.getID())
 					.findAny()
 					.map(Chat::getRecipient)
-					.ifPresent(u -> { ((User) u).setStatus(e.get()); Platform.runLater(chatList::refresh); }));
+					.ifPresent(u -> { ((User) u).setStatus(e.get()); Platform.runLater(() -> ListViewRefresh.deepRefresh(chatList)); }));
 
 		// Listen to contacts changes
 		eventBus.register(ContactOperation.class, e -> {
@@ -184,7 +183,7 @@ public final class ChatScene implements Restorable {
 			switch (e.getOperationType()) {
 				case ADD:
 					localDB.getUsers().put(contact.getName(), contact);
-					Chat chat = contact instanceof User ? new Chat(contact) : new GroupChat(client.getSender(), contact);
+					final Chat chat = contact instanceof User ? new Chat(contact) : new GroupChat(client.getSender(), contact);
 					Platform.runLater(() -> chatList.getItems().add(chat));
 					break;
 				case REMOVE:
@@ -356,6 +355,7 @@ public final class ChatScene implements Restorable {
 			try {
 				final var fileBytes = Files.readAllBytes(file.toPath());
 				pendingAttachment = new Attachment(fileBytes, type);
+				checkPostConditions(false);
 				// Setting the preview image as image of the attachmentView
 				if (type == AttachmentType.PICTURE)
 					attachmentView.setImage(new Image(new ByteArrayInputStream(fileBytes), DEFAULT_ICON_SIZE, DEFAULT_ICON_SIZE, true, true));
@@ -414,9 +414,9 @@ public final class ChatScene implements Restorable {
 				|| !settings.isEnterToSend() && e.getCode() == KeyCode.ENTER && e.isControlDown());
 	}
 
-	private void checkPostConditions(boolean sendKeyPressed) {
+	private void checkPostConditions(boolean postMessage) {
 		if (!postingPermanentlyDisabled) {
-			if (!postButton.isDisabled() && sendKeyPressed) postMessage();
+			if (!postButton.isDisabled() && postMessage) postMessage();
 			postButton.setDisable(messageTextArea.getText().isBlank() && pendingAttachment == null || currentChat == null);
 		} else {
 			final var noMoreMessaging = "Go online to send messages";
@@ -499,7 +499,7 @@ public final class ChatScene implements Restorable {
 				localDB.getChats().remove(currentChat);
 				localDB.getChats().add(0, currentChat);
 			});
-			messageList.refresh();
+			ListViewRefresh.deepRefresh(messageList);
 			scrollToMessageListEnd();
 
 			// Request a new ID generator if all IDs were used
diff --git a/client/src/main/java/envoy/client/ui/controller/ContactSearchScene.java b/client/src/main/java/envoy/client/ui/controller/ContactSearchScene.java
index 5b5c448..e21c646 100644
--- a/client/src/main/java/envoy/client/ui/controller/ContactSearchScene.java
+++ b/client/src/main/java/envoy/client/ui/controller/ContactSearchScene.java
@@ -118,7 +118,8 @@ public class ContactSearchScene {
 				final var event = new ContactOperation(user, ElementOperation.ADD);
 				// Sends the event to the server
 				eventBus.dispatch(new SendEvent(event));
-				// Updates the UI
+				// Removes the chosen user and updates the UI
+				userList.getItems().remove(user);
 				eventBus.dispatch(event);
 				logger.log(Level.INFO, "Added user " + user);
 			}));
diff --git a/client/src/main/java/envoy/client/ui/controller/GroupCreationScene.java b/client/src/main/java/envoy/client/ui/controller/GroupCreationScene.java
index e6ca29a..71c7dd4 100644
--- a/client/src/main/java/envoy/client/ui/controller/GroupCreationScene.java
+++ b/client/src/main/java/envoy/client/ui/controller/GroupCreationScene.java
@@ -16,6 +16,8 @@ import envoy.client.ui.ClearableTextField;
 import envoy.client.ui.SceneContext;
 import envoy.client.ui.listcell.ContactControl;
 import envoy.client.ui.listcell.ListCellFactory;
+import envoy.data.Contact;
+import envoy.data.Group;
 import envoy.data.User;
 import envoy.event.EventBus;
 import envoy.event.GroupCreation;
@@ -50,6 +52,8 @@ public class GroupCreationScene {
 
 	private SceneContext sceneContext;
 
+	private LocalDB localDB;
+
 	private static final EventBus eventBus = EventBus.getInstance();
 
 	@FXML
@@ -66,7 +70,8 @@ public class GroupCreationScene {
 	 * @since Envoy Client v0.1-beta
 	 */
 	public void initializeData(SceneContext sceneContext, LocalDB localDB) {
-		this.sceneContext = sceneContext;
+		this.sceneContext	= sceneContext;
+		this.localDB		= localDB;
 		Platform.runLater(() -> userList.getItems()
 			.addAll(localDB.getChats()
 				.stream()
@@ -109,14 +114,47 @@ public class GroupCreationScene {
 		if (!Bounds.isValidContactName(name)) {
 			new Alert(AlertType.ERROR, "The entered group name is not valid (" + Bounds.CONTACT_NAME_PATTERN + ")").showAndWait();
 			groupNameField.getTextField().clear();
+		} else if (groupNameAlreadyPresent(name)) {
+			final var alert = new Alert(AlertType.WARNING, "You already have a group with that name.", ButtonType.OK, ButtonType.CANCEL);
+			alert.setTitle("Create Group?");
+			alert.setHeaderText("Proceed?");
+			alert.showAndWait().filter(btn -> btn == ButtonType.OK).ifPresent(btn -> createGroup(name));
 		} else {
-			eventBus.dispatch(new SendEvent(
-					new GroupCreation(name, userList.getSelectionModel().getSelectedItems().stream().map(User::getID).collect(Collectors.toSet()))));
 			new Alert(AlertType.INFORMATION, String.format("Group '%s' successfully created.", name)).showAndWait();
-			sceneContext.pop();
+			createGroup(name);
 		}
 	}
 
+	/**
+	 * Creates a new group with the given name and all selected members.<br>
+	 * Additionally pops the scene automatically.
+	 *
+	 * @param name the chosen group name
+	 * @since Envoy Client v0.1-beta
+	 */
+	private void createGroup(String name) {
+		eventBus.dispatch(new SendEvent(
+				new GroupCreation(name, userList.getSelectionModel().getSelectedItems().stream().map(User::getID).collect(Collectors.toSet()))));
+		sceneContext.pop();
+	}
+
+	/**
+	 * Returns true if the proposed group name is already present in the users
+	 * {@code LocalDB}.
+	 *
+	 * @param newName the chosen group name
+	 * @return true if this name is already present
+	 * @since Envoy Client v0.1-beta
+	 */
+	public boolean groupNameAlreadyPresent(String newName) {
+		return localDB.getChats()
+			.stream()
+			.map(Chat::getRecipient)
+			.filter(Group.class::isInstance)
+			.map(Contact::getName)
+			.anyMatch(newName::equals);
+	}
+
 	@FXML
 	private void backButtonClicked() { sceneContext.pop(); }
 }