diff --git a/src/callbacks.py b/src/callbacks.py
index f97d664..d69e614 100644
--- a/src/callbacks.py
+++ b/src/callbacks.py
@@ -161,11 +161,15 @@ def tox_file_recv(window, tray):
 
 
 def file_recv_chunk(tox, friend_number, file_number, position, chunk, length, user_data):
-    Profile.get_instance().incoming_chunk(friend_number, file_number, position, chunk[:length] if length else None)
+    invoke_in_main_thread(Profile.get_instance().incoming_chunk,
+                          friend_number,
+                          file_number,
+                          position,
+                          chunk[:length] if length else None)
 
 
 def file_chunk_request(tox, friend_number, file_number, position, size, user_data):
-    Profile.get_instance().outgoing_chunk(
+    invoke_in_main_thread(Profile.get_instance().outgoing_chunk,
                           friend_number,
                           file_number,
                           position,
diff --git a/src/images/accept.png b/src/images/accept.png
new file mode 100755
index 0000000..5612f26
Binary files /dev/null and b/src/images/accept.png differ
diff --git a/src/images/decline.png b/src/images/decline.png
new file mode 100755
index 0000000..dfdf85d
Binary files /dev/null and b/src/images/decline.png differ
diff --git a/src/list_items.py b/src/list_items.py
index 446bb09..7b4f36d 100644
--- a/src/list_items.py
+++ b/src/list_items.py
@@ -188,12 +188,18 @@ class FileTransferItem(QtGui.QListWidget):
 
         self.cancel = QtGui.QPushButton(self)
         self.cancel.setGeometry(QtCore.QRect(500, 0, 50, 50))
-        self.cancel.setText("Cancel")
+        pixmap = QtGui.QPixmap(curr_directory() + '/images/decline.png')
+        icon = QtGui.QIcon(pixmap)
+        self.cancel.setIcon(icon)
+        self.cancel.setIconSize(QtCore.QSize(50, 50))
         self.cancel.clicked.connect(lambda: self.cancel_transfer(friend_number, file_number))
 
         self.accept = QtGui.QPushButton(self)
         self.accept.setGeometry(QtCore.QRect(450, 0, 50, 50))
-        self.accept.setText("Accept")
+        pixmap = QtGui.QPixmap(curr_directory() + '/images/accept.png')
+        icon = QtGui.QIcon(pixmap)
+        self.accept.setIcon(icon)
+        self.accept.setIconSize(QtCore.QSize(50, 50))
         self.accept.clicked.connect(lambda: self.accept_transfer(friend_number, file_number))
         self.accept.setVisible(is_incoming_transfer)