Not sure if this has been fixed in the new version ( I use 4.7 atm) but if you press ctrl z too many times too fast, it crashes the engine
Hey Kami1232,
Thank you for notifying us of the Ctrl+Z bug. This was an issue in 4.7.6 however, it’s been fixed and you should not run into this issue in 4.8.1. If you do, please reply back with the steps to reproduce this issue so that we can inform our developers.
Thank you and have a wonderful weekend! 