If the LanguageTool Word add-in shows a white or blank start screen when you open it, this usually means firewall or internet settings are blocking the add-in’s connection.
How to troubleshoot
Make sure your Windows and Microsoft Word have all the latest updates installed.
Confirm you have an active internet connection.
If you’re using a managed or controlled device, ask your system administrator to ensure external websites like https://languagetool.org are not being blocked.
Additional test
Try installing and running another Word add-in such as Adobe Sign.
If the Adobe Sign add-in works fine but the LanguageTool add-in does not, the issue is likely specific to LanguageTool and related to network or security restrictions.