I am unable to write text in Office Toolbox textboxes (document name and notes)
This issue comes after installing Windows 10 Update 1903 and has been reported to and acknowledged by Microsoft...
https://social.msdn.microsoft.com/Forums/Windowsdesktop/en-US/679cbc94-a503-451b-9ebb-b5fe9c1017b3/bug-in-windows-10-version-1903?forum=windowscompatibility
We do have a workaround to fix this issue until Microsoft release a fix for this, hopefully in the next release.
Automated Fix
Download the fix (addin_key_fix.exe) and open it. You will be prompted with the following warning.
Click Yes and the fix will be applied.
Manual Fix
You can also edit the Windows registry manually by adding a new key named Settings to HKEY_CURRENT_USER\Software\Microsoft\Office\Word\Addins\NovaCoreAddIn.NovaCoreInterface
Then add a new DWORD value in the Settings key named DisableKeyboardHook and set it's value to 1
This must be repeated for the Excel and PowerPoint sections as well. So repeat this for the keys:
HKEY_CURRENT_USER\Software\Microsoft\Office\Excel\Addins\NovaCoreAddIn.NovaCoreInterface
HKEY_CURRENT_USER\Software\Microsoft\Office\PowerPoint\Addins\NovaCoreAddIn.NovaCoreInterface