Undo In Cubase

Hi
Im just having a recent issue with undo in Cubase 12. Its grayed out/unavailable for Any of the usual things that you do such. For example if I record something I can’t undo it
Delete something in Project window can’t undo it. Don’t know what has happened
Any help would be much appreciated
James

Hi,

What does the History window look like, please? Can you see the actions in it?

What about the Preferences > General > Maximum Undo Steps? Is it set to oo (maximum)?