Hello, I'm using Microsoft 365 and yesterday the Replace dialogue box stopped loading with Word when I pressed Ctrl-H or selected "Replace" from the Home tab. (The Find function still worked.)

I've tried uninstalling and reinstalling 365 but nothing has helped. I even downloaded and uninstalled 365 using the "Microsoft Support and Recovery Assistant" but when I reinstalled 365 Ctrl-H still didn't work with Word. (But it works with Excel and Powerpoint.)

When I press Ctrl-H, just about everything on the ribbon either goes blank or greys out until I press Esc.

Any suggestions of how to repair this?

Thanks, Roger

Does this happen when you start Word in safe mode?
Open Office apps in safe mode on a Windows PC - Microsoft Office

I've just checked and it works OK in safe mode. Does that provide any clues as to what's gone wrong?

I seem to have sorted the problem! I went through the troubleshooting guide at How to troubleshoot problems that occur when you start or use Word - Office | Microsoft Docs.

After deleting the Word data registry subkey at HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\W ord\Data the Replace function started working again.

I'm grateful for your reply, Charles - when you asked if it worked in safe mode that got me thinking in right direction. Many thanks!

You are welcome. When things get wonky in Word that is usually my starting point. (If it does not work in safe mode, too, I will usually try a repair.)