Kivy Application - Widgets Disappear When Resizing Window Issue

Question

Kivy users, Kivy lovers,

It's worth noting that a similar problem was reported in Kivy version 1.9.1, but it was supposedly resolved with an update. However, with the current version (2.3.0), the issue has reappeared noticeably. Therefore, please do not classify my question as previously asked. The same problem is repeating in the new version.

I'm relatively new to Kivy, having started just a few days ago. Regardless of which example code I try, or even if I attempt a simple "Hello world" application with just a single label, I'm encountering a consistent problem. Both Kivy and KivyMD exhibit the same issue.

The specific problem is that when I resize the application window, everything appears to be working initially, but after a while, all widgets disappear, leaving only a blank screen. The window remains responsive, and I can still move and resize it, but none of the widgets are visible any more.

Any insights, guidance, or potential solutions to troubleshoot and resolve this issue would be greatly appreciated.

Thanks in advance for your assistance!

I've checked and ensured the following:

Installed Kivy and KivyMD stable releases using Poetry, and the virtual environment.
When the problem arose, I inspected the messages carefully and found a WARNING KivyMD is outdated (1.2.0)
With poetry I could not upgrade it, I created a pip env

pip install kivy[base] kivymd

but got the same warning again, KivyMD version 1.2.0 outdated...

So hopping someone had fixed this bug I created a new pip env and reinstalled both from github with latest development versions.

pip install git+https://github.com/kivy/kivy.git
pip install git+https://github.com/kivymd/KivyMD.git

Graphics drivers are up-to-date.
Python is the latest version 3.12.
Windows 11 is fully updated.
Kivy and KivyMD are the most recent versions 3.0.1dev and 2.0.0dev respectively. (Remember that I already checked the stable Kivy release 2.3.0)
I'm not using Anaconda or Miniconda.
OpenGL drivers etc are automatically updated.
I couldn't locate any config.ini file or such within my project or virtual environment to inspect for possible suspects.

Resizing app window ends always with following screen and widgets disappear.

SCREEN LOG:

(venv) D:\Learning\Projects\Kivy\Udemy\hello_kivymd>d:/Learning/Projects/Kivy/Udemy/hello_kivymd/venv/Scripts/python.exe d:/Learning/Projects/Kivy/Udemy/hello_kivymd/hello/hello.py
[INFO   ] [Logger      ] Record log in C:\Users\eakar\.kivy\logs\kivy_24-01-24_7.txt
[INFO   ] [deps        ] Successfully imported "kivy_deps.angle" 0.4.0
[INFO   ] [deps        ] Successfully imported "kivy_deps.glew" 0.3.1
[INFO   ] [deps        ] Successfully imported "kivy_deps.sdl2" 0.7.0
[INFO   ] [Kivy        ] v3.0.0.dev0
[INFO   ] [Kivy        ] Installed at "d:\Learning\Projects\Kivy\Udemy\hello_kivymd\venv\Lib\site-packages\kivy\__init__.py"
[INFO   ] [Python      ] v3.12.1 (tags/v3.12.1:2305ca5, Dec  7 2023, 22:03:25) [MSC v.1937 64 bit (AMD64)]
[INFO   ] [Python      ] Interpreter at "d:\Learning\Projects\Kivy\Udemy\hello_kivymd\venv\Scripts\python.exe"
[INFO   ] [Logger      ] Purge log fired. Processing...
[INFO   ] [Logger      ] Purge finished!
[INFO   ] [KivyMD      ] 2.0.1.dev0, git-ab67546, 2024-01-23 (installed at "d:\Learning\Projects\Kivy\Udemy\hello_kivymd\venv\Lib\site-packages\kivymd\__init__.py")
[INFO   ] [Factory     ] 195 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: sdl2
[INFO   ] [Window      ] Provider: sdl2
[INFO   ] [GL          ] Using the "OpenGL" graphics system
[INFO   ] [GL          ] GLEW initialization succeeded
[INFO   ] [GL          ] Backend used 
[INFO   ] [GL          ] OpenGL version 
[INFO   ] [GL          ] OpenGL vendor 
[INFO   ] [GL          ] OpenGL renderer 
[INFO   ] [GL          ] OpenGL parsed version: 4, 6
[INFO   ] [GL          ] Shading version 
[INFO   ] [GL          ] Texture max size <16384>
[INFO   ] [GL          ] Texture max units <32>
[INFO   ] [Window      ] auto add sdl2 input provider
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[INFO   ] [Clipboard   ] Provider: winctypes
[INFO   ] [GL          ] NPOT texture support is available
[INFO   ] [Base        ] Start application main loop
[INFO   ] [KivyMD      ] Color scheme generation. Get a color scheme from an installed palette - 0.004485299999942072 sec.
 Exception ignored on calling ctypes callback function: >
 Traceback (most recent call last):
   File "d:\Learning\Projects\Kivy\Udemy\hello_kivymd\venv\Lib\site-packages\kivy\core\window\window_sdl2.py", line 998, in _wnd_proc
     return windll.user32.CallWindowProcW(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 OSError: exception: access violation reading 0x000002909F58E3A8
[INFO   ] [Base        ] Leaving application in prog

AND the content of kivy_24-01-24_7.txt file mentioned above

[INFO   ] Logger: Record log in C:\Users\eakar\.kivy\logs\kivy_24-01-24_7.txt
[INFO   ] deps: Successfully imported "kivy_deps.angle" 0.4.0
[INFO   ] deps: Successfully imported "kivy_deps.glew" 0.3.1
[INFO   ] deps: Successfully imported "kivy_deps.sdl2" 0.7.0
[INFO   ] Kivy: v3.0.0.dev0
[INFO   ] Kivy: Installed at "d:\Learning\Projects\Kivy\Udemy\hello_kivymd\venv\Lib\site-packages\kivy\__init__.py"
[INFO   ] Python: v3.12.1 (tags/v3.12.1:2305ca5, Dec  7 2023, 22:03:25) [MSC v.1937 64 bit (AMD64)]
[INFO   ] Python: Interpreter at "d:\Learning\Projects\Kivy\Udemy\hello_kivymd\venv\Scripts\python.exe"
[INFO   ] Logger: Purge log fired. Processing...
[INFO   ] Logger: Purge finished!
[INFO   ] KivyMD: 2.0.1.dev0, git-ab67546, 2024-01-23 (installed at "d:\Learning\Projects\Kivy\Udemy\hello_kivymd\venv\Lib\site-packages\kivymd\__init__.py")
[INFO   ] Factory: 195 symbols loaded
[INFO   ] Image: Providers: img_tex, img_dds, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO   ] Text: Provider: sdl2
[INFO   ] Window: Provider: sdl2
[INFO   ] GL: Using the "OpenGL" graphics system
[INFO   ] GL: GLEW initialization succeeded
[INFO   ] GL: Backend used 
[INFO   ] GL: OpenGL version 
[INFO   ] GL: OpenGL vendor 
[INFO   ] GL: OpenGL renderer 
[INFO   ] GL: OpenGL parsed version: 4, 6
[INFO   ] GL: Shading version 
[INFO   ] GL: Texture max size <16384>
[INFO   ] GL: Texture max units <32>
[INFO   ] Window: auto add sdl2 input provider
[INFO   ] Window: virtual keyboard not allowed, single mode, not docked
[INFO   ] Clipboard: Provider: winctypes
[INFO   ] GL: NPOT texture support is available
[INFO   ] Base: Start application main loop
[INFO   ] KivyMD: Color scheme generation. Get a color scheme from an installed palette - 0.004485299999942072 sec.
[WARNING] stderr: Exception ignored on calling ctypes callback function: >
[WARNING] stderr: Traceback (most recent call last):
[WARNING] stderr:   File "d:\Learning\Projects\Kivy\Udemy\hello_kivymd\venv\Lib\site-packages\kivy\core\window\window_sdl2.py", line 998, in _wnd_proc
[WARNING] stderr:     return windll.user32.CallWindowProcW(
[WARNING] stderr:            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[WARNING] stderr: OSError: exception: access violation reading 0x000002909F58E3A8
[INFO   ] Base: Leaving application in progress...

Kivy Application - Widgets Disappear When Resizing Window Issue

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