Hi, I had this issue using version 3.16.0-1 and it still occurs for me now that I have updated to 3.16.2-1:
2:~$ mkdir /tmp/fake-home meld 2:~$ cp .Xauthority /tmp/fake-home/ 2:~$ HOME=/tmp/fake-home meld Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/meld/meldapp.py", line 72, in do_startup self.new_window() File "/usr/lib/python2.7/dist-packages/meld/meldapp.py", line 138, in new_window window = meldwindow.MeldWindow() File "/usr/lib/python2.7/dist-packages/meld/meldwindow.py", line 266, in __init__ self.widget.set_help_overlay(shortcut_window) AttributeError: 'ApplicationWindow' object has no attribute 'set_help_overlay' Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/meld/meldapp.py", line 78, in do_command_line tab = self.parse_args(command_line) File "/usr/lib/python2.7/dist-packages/meld/meldapp.py", line 336, in parse_args focus=i == 0) File "/usr/lib/python2.7/dist-packages/meld/meldapp.py", line 149, in open_files window = self.get_meld_window() File "/usr/lib/python2.7/dist-packages/meld/meldapp.py", line 144, in get_meld_window return self.get_active_window().meldwindow AttributeError: 'NoneType' object has no attribute 'meldwindow'