Maya 2025 - mmSolver UIs Will Not Open

[david-cattermole]

Problem

Opening UIs with the latest "develop" branch code (8692072) causes an error, and the UI does not open.

All UIs in mmSolver use BaseMayaWindow, which uses the mix-in class maya.app.general.mayaMixin.MayaQWidgetDockableMixin, however in Maya 2025, this causes an error. The same code in Maya 2024 works fine.

Expected behavior:
A UI should open.

Actual behavior:
The tool errors;

# Error: object.__init__() takes exactly one argument (the instance to initialize)
# # Traceback (most recent call last):
# #   File "<maya console>", line 2, in <module>
# #   File "C:\Users\user\Documents\maya\2025\modules\mayaMatchMoveSolver-0.5.1-maya2025-win64\python\mmSolver\tools\userprefswindow\tool.py", line 36, in open_window
# #     pref_window.main()
# #   File "C:\Users\user\Documents\maya\2025\modules\mayaMatchMoveSolver-0.5.1-maya2025-win64\python\mmSolver\tools\userprefswindow\ui\pref_window.py", line 161, in main
# #     win = PrefWindow.open_window(show=show, auto_raise=auto_raise, delete=delete)
# #   File "C:\Users\user\Documents\maya\2025\modules\mayaMatchMoveSolver-0.5.1-maya2025-win64\python\mmSolver\ui\base_maya_window.py", line 202, in open_window
# #     cls.instance = cls(parent=parent, name=name)
# #   File "C:\Users\user\Documents\maya\2025\modules\mayaMatchMoveSolver-0.5.1-maya2025-win64\python\mmSolver\tools\userprefswindow\ui\pref_window.py", line 58, in __init__
# #     super(PrefWindow, self).__init__(parent, name=name)
# #   File "C:\Users\user\Documents\maya\2025\modules\mayaMatchMoveSolver-0.5.1-maya2025-win64\python\mmSolver\ui\base_maya_window.py", line 101, in __init__
# #     super(BaseMayaWindow, self).__init__()
# #   File "C:\Program Files\Autodesk\Maya2025\Python\Lib\site-packages\maya\app\general\mayaMixin.py", line 262, in __init__
# #     super(MayaQWidgetDockableMixin, self).__init__(parent=parent, *args, **kwargs) # Init all baseclasses (including QWidget) of the main class
# #   File "C:\Program Files\Autodesk\Maya2025\Python\Lib\site-packages\maya\app\general\mayaMixin.py", line 78, in __init__
# #     super(MayaQWidgetBaseMixin, self).__init__(parent=parent, *args, **kwargs) # Init all baseclasses (including QWidget) of the main class
# # TypeError: object.__init__() takes exactly one argument (the instance to initialize)    

Steps to Reproduce

Run the provided mixin_bug_v1.py script, like this:

import mixin_bug_v1
mixin_bug_v1.main()

The issue can be fixed by changing C:\Program Files\Autodesk\Maya2025\Python\Lib\site-packages\maya\app\general\mayaMixin.py line 78, from this:

super(MayaQWidgetBaseMixin, self).__init__(parent=parent, *args, **kwargs) # Init all baseclasses (including QWidget) of the main class

to this:

super(MayaQWidgetBaseMixin, self).__init__(parent, *args, **kwargs) # Init all baseclasses (including QWidget) of the main class

... simply replacing the parent=parent with parent.

Software Versions

• mmSolver version: 0.5.1 develop branch; 8692072

• Maya version: 2025

Operating System: Windows 10 Pro v2009 (Build: 19045)
Cut ID: 202409190603-cbdc5a7e54
Maya Version: Autodesk MAYA 2025.3
Maya API: 20250300
Qt Version: 6.5.3
Compositing Manager: True
Window Manager: Windows Aero
GPU:   Version : 2016.11.62.12. Feature Level 5.
  Adapter : NVIDIA GeForce GTX 1050/PCIe/SSE2
  Vendor ID: 4318. Device ID : 22811
  Driver : C:\WINDOWS\System32\DriverStore\FileRepository\iigd_dch.inf_amd64_91e2144e79bce669\ig9icd64.dll.dll:27.20.100.9664.
  API : OpenGL V.4.6.
  Max texture size : 16384 * 16384.
  Max texture coords : 32
  Shader versions supported (Vertex: 5, Geometry: 5, Pixel 5).
  Shader compiler profile : (Best card profile)
  Active stereo support available : 0
  GPU Memory Limit : 4096 MB.
  CPU Memory Limit : 30988.7 MB.

• Operating System (OS): Windows (and probably Linux too, but not tested)