Unable To Read Math ML In Edge or Brave

[Bhavya shah]

I am using NVDA 2025.3 RC 1, Math CAT 0.7.3, and Windows 11. I am having issues reading Math ML content, say a Math-related Wikipedia entry, on Edge and Brave. (Firefox still seems to work.) Log snippet when I press "m" on such a page below:
"DEBUGWARNING - NVDAObjects.IAccessible.ia2Web.Math._get_mathMl (17:10:23.555) - MainThread (20836):
Error retrieving math. Not supported in this browser or ISimpleDOM COM proxy not registered.
Traceback (most recent call last):
  File "NVDAObjects\IAccessible\ia2Web.pyc", line 336, in _get_mathMl
  File "comtypes\_post_coinit\unknwn.pyc", line 404, in QueryInterface
  File "monkeyPatches\comtypesMonkeyPatches.pyc", line 33, in __call__
_ctypes.COMError: (-2147467262, 'No such interface supported', (None, None, None, 0, None))
IO - speech.speech.speak (17:10:23.560) - MainThread (20836):
Speaking ['math']"

Any ideas on troubleshooting this? I would appreciate any assistance.

Kind Regards,
Bhavya Shah
B.S. in Mathematical and Computational Science | Stanford '24
LinkedIn: https://www.linkedin.com/in/bhavyashah125/

[Andrew Downie]

MathML is reading in Edge for me with both Access8Math and MathCAT with NVDA 2025.3.a RC1.

Andrew

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[Cyrille BOUGOT]

Hi

I have been facing the same issue with NVDA 2025.3rc1 and 2025.3.1rc1. I do not know for how long though. I have tried with Chrome (141.0.7390.78) as well as with Edge.

I have tried to restart with add-ons disabled and to run the COM registration tool without any success.

Then I have succeeded in making it work but I do not remember how. I had tried:

- running older versions (2025.2, 2024.4.2) and running their COM registration tools

- restarting the browser

I do not know if it is completely fixed because I seem to remember that during my test phase, the issue had turned back and gone away again.

You may open a GitHub issue because it has occurred at least on two machines.

Cheers,

Cyrille