Braille doesn't work on last snapshot

[dreinn]

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.

[nvdaes]

Hello. I cannot reproduce this with the Focus braille display. But I saw this behavior in a previous portable alpha version with an EcoBraille display. I fixed it with a workaround, that was to enable the braille viewer.
Unfortunately I don't have an Ecobraille anymore to test, but you may try to enable the braille viewer to see if this affects this behavior with some braille displays.
As you may know, braille viewer is available from NVDA's menu, tools submenu. I mention how to enable it just in case.
Hope this helps.

[Adriani90]

I am on last alpha with a Brailliant BI40x and I cannot reproduce this issue.
@burmancomp what Braille display do you have? Can you reproduce?

[burmancomp]

I am writing with nvda_snapshot_alpha-34750,8a82bd5b.exe as portable installation, braille display is caiku albatross 80. All seems to work normally. I have also updated installed version to current alpha at same laptop, and all seems to work normally as well. Os is w11 23h2.

[seanbudd]

@Emil-18 - see also #17092

[dreinn]

I confirm that if I activate the braille viewer, then I can use the display braille correctly.
For the moment, a great thanks to @nvdaes for the work around.
If you need more information for the issue, let me know!

[Adriani90]

Cc: @bramd , @dkager , @LeonarddeR

[josephsl]

Hi,

Is this happening if NVDA is told to show speech output in braille? If yes, I think we need to combine this issue with #17092 as the cause might be the same.

Thanks.