macOS Big Sur (11.x): Unable to load OpenGL library

[Avakining]

Describe the bug
A clear and concise description of what the bug is.

Steps to reproduce the behaviour:

1. Install Amulet on Mac (virtual environment or not)
2. Run Amulet
3. Open any world (vanilla, fabric, forge, any supported version)
4. Only "Convert" and "About" tabs appear

Expected behavior
A tab with the 3D editor also appears

Screenshots

Desktop (please complete the following information):

• OS: macOS 11.2.3
• Version 8.1.b1

Additional context

There are these error messages in Terminal:

Traceback (most recent call last):
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/darwin.py", line 35, in GL
    return ctypesloader.loadLibrary(
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/ctypesloader.py", line 36, in loadLibrary
    return _loadLibraryWindows(dllType, name, mode)
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/ctypesloader.py", line 89, in _loadLibraryWindows
    return dllType( name, mode )
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/ctypes/__init__.py", line 374, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: ('dlopen(OpenGL, 10): image not found', 'OpenGL', None)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/cdp/amulet/lib/python3.9/site-packages/amulet_map_editor/api/framework/pages/world_page.py", line 44, in load_extension
    module = importlib.import_module(module_name)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 790, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/Users/cdp/amulet/lib/python3.9/site-packages/amulet_map_editor/programs/edit/__init__.py", line 1, in <module>
    from amulet_map_editor.programs.edit.edit import EditExtension
  File "/Users/cdp/amulet/lib/python3.9/site-packages/amulet_map_editor/programs/edit/edit.py", line 12, in <module>
    from amulet_map_editor.programs.edit.api.canvas.edit_canvas import EditCanvas
  File "/Users/cdp/amulet/lib/python3.9/site-packages/amulet_map_editor/programs/edit/api/__init__.py", line 2, in <module>
    from .canvas import EditCanvas
  File "/Users/cdp/amulet/lib/python3.9/site-packages/amulet_map_editor/programs/edit/api/canvas/__init__.py", line 1, in <module>
    from .edit_canvas import EditCanvas
  File "/Users/cdp/amulet/lib/python3.9/site-packages/amulet_map_editor/programs/edit/api/canvas/edit_canvas.py", line 5, in <module>
    from .base_edit_canvas import BaseEditCanvas
  File "/Users/cdp/amulet/lib/python3.9/site-packages/amulet_map_editor/programs/edit/api/canvas/base_edit_canvas.py", line 3, in <module>
    from OpenGL.GL import (
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/GL/__init__.py", line 3, in <module>
    from OpenGL import error as _error
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/error.py", line 12, in <module>
    from OpenGL import platform, _configflags
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/__init__.py", line 36, in <module>
    _load()
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/__init__.py", line 33, in _load
    plugin.install(globals())
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/baseplatform.py", line 97, in install
    namespace[ name ] = getattr(self,name,None)
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/darwin.py", line 62, in GetCurrentContext
    return self.CGL.CGLGetCurrentContext
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/darwin.py", line 45, in CGL
    def CGL(self): return self.GL
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/Users/cdp/amulet/lib/python3.9/site-packages/OpenGL/platform/darwin.py", line 41, in GL
    raise ImportError("Unable to load OpenGL library", *err.args)
ImportError: ('Unable to load OpenGL library', 'dlopen(OpenGL, 10): image not found', 'OpenGL', None)

[gentlegiantJGC]

Have a read through of this and see if it fixes your issue.
PixarAnimationStudios/OpenUSD#1372

[Avakining]

Yes, that fixes it.

[gentlegiantJGC]

I am going to reopen this so that people can find the solution and it doesn't get reported again.
Once it gets fixed in PyOpenGL I will close this.

[gentlegiantJGC]

The next build should fix this issue.
If it is still an issue in the next build please reopen this issue and let me know.