@TimWardCam Thanks for reporting the issue. As you know, we're a volunteer-driven project, but hopefully someone in the QA community can identify the issue soon. (There are many combinations of software that can trigger corner-cases like this.) Have you tried starting in Safe Mode? You could also uninstall and reinstall the older version – https://downloadarchive.documentfoundation.org/libreoffice/old/25.8.7.3/win/x86_64/ – And then disable auto-updates (Tools > Options > LibreOffice > Online Update).