Hello @Alice Farrer ,
Where were you using the shortcut before it stopped working?
In other to be sure, try the following:
- Open Word or any office application, type something, then press the shortcut to see if it works.
- Try doing the same thing using notepad or any text editor.
- Try copying something from say the desktop to another folder, then press control Z to see.
- You can even delete something to the recycle Bing, then press the shortcut to see.
Alternatively, we need to be sure that Z is working without issues. So, try typing Z somewhere and see if it works.
Let us know how it goes. Thank you.