In UPBGE 0.3 Alpha on both my laptop and pc, I am unable to undo any actions in any mode (Object, edit, sculpt etc). I have double checked that I have global undo enabled, checked that the undo key bind is still active, reset to default settings and reinstalled the software multiple times on both hardware but nothing has worked. Does anybody have any possible solutions to this? Don’t think it is a hardware problem as it is happening on both of my devices and it’s not a keyboard problem because they both have separate keyboards. Any advice would be greatly appreciated, thank you 
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I just checked under windows and i can undo any operation (move an object, create, insert keyframe, etc).
It is a bit strange. What operating system do you use?
Does it occur the same with blender official?
Maybe you should remove userpref.blend under Appdata/UPBGE at c:/users/xxxxxx/