@florisbiskamp @aesthr Global undo is the worst!

And then yeah, I have a worksheet that gives a bunch of viewpoints on some specific data. Added a new sheet for a new viewpoint, copied it to another worksheet (different raw data, same design), and they added named variables pointing at the first worksheet, shadowing over the ones that existed already. I knew I had to copy/paste over the values in the formula since those got changed, but took me a minute to figure out I had to delete the names that had been added to the name manager too.