I have Windows 10. I am wondering whether my attempt at installing Zoho, on a friend’s suggestion to improve compatibility, has somehow caused this mishap.
Does it open in safe mode? Start menu > LibreOffice > LibreOffice (safe mode)?
Zoho is online so unlikely anything to do with issue. Restart your computer in case it is waiting to restart after updates. In Start menu > settings > Update & Security > Windows Update make sure that you install any outstanding updates like Net Framework but no need to update Windows version now. Maybe it works afterwards otherwise:
Click Start menu > LibreOffice > LibreOffice (safe mode). If you press Continue in Safe Mode and LO runs OK then the user profile might be corrupted somehow. It might be best to backup user folder so close LO.
In File Explorer (Win+E), in the View tab, tick the box Hidden items.
Navigate to C:\Users\[username]\AppData\Roaming\LibreOffice\4 right-click and drag the folder user to a blank space just below and release, click the context menu Copy here and it will create a copy of the user folder in case things go sour. Leave folder open for now
Reopen LO in Safe mode and tick the box Restore from backup > Restore user configuration to the last known working state and press button Apply changes and Restart. If it all works the carry on with using LO like everybody else.
If not then try the button Reset to factory settings > Reset settings and user interface modifications. This should fix most issues. If not the Reset entire user profile will reset everything back to factory settings.
If you did select the entire user profile option then all your autocorrect and templates will have gone. This is why we saved a copy. A new user folder will be created. Drag your data folders back into the new user folder: Autocorrect, Autotext, backup, template, wordbook.
Hope this helps. Cheers, Al