I was just 3d modeling as usual and I enabled the Archipack blender addon. Everything was fine until I tried to undo something and it didn't work. I went to a new project and the same thing happened. I moved a mesh in object mode and it wouldn't undo. My shortcut is CTRL-Z as usual.
I first disabled the addon, which did nothing. I then tried manually going to commands and undoing, and that didn't work. I then checked my keyboard in another program (It works fine). I tried all the blender stack exchange forms, and none of them worked. I updated windows, Gforce, and my driver (Still no difference).
Then as a last resort completely uninstalled blender and its cache, and installed the newest version, and still it doesn't work. I've studied my undo settings and everything, blender is refusing to undo!