Steps to reproduce:

Start NVDA, select MDV Lilli display driver.

Actual behavior:

Expected behavior:

NVDA logs, crash dumps and other attachments:

This is what NVDA logs when I press a navigation key from the display braille:
ERROR - scriptHandler.executeScript (09:48:48.268) - MainThread (16984):
error executing script: <bound method GlobalCommands.script_braille_scrollForward of <globalCommands.GlobalCommands object at 0x07C918F0>> with gesture 'RG'
Traceback (most recent call last):
File "scriptHandler.pyc", line 300, in executeScript
File "globalCommands.pyc", line 4034, in script_braille_scrollForward
File "braille.pyc", line 2834, in scrollForward
File "braille.pyc", line 1995, in scrollForward
File "braille.pyc", line 1988, in _nextWindow
File "braille.pyc", line 1890, in _get_windowStartPos
File "braille.pyc", line 1880, in windowPosToBufferPos
ZeroDivisionError: integer division or modulo by zero

System configuration

NVDA portable:

NVDA version: alpha-34735,bdd31537 (2025.1.0.34735)

Windows version: Microsoft Windows [Versione 10.0.19045.4894]

Other questions

Does the issue still occur after restarting your computer? Yes.

Have you tried any other versions of NVDA? If so, please report their behaviors. Yes, it works on all version. 2025.1 seems not compatible.