Not a Problem
many times when i press undo on the program (the windows one), it undoes ALL the work i did, and not just the last thing.
also, would it be possible for the developers to make it possible to use CTRL+Z and CTRL+Y? those are much easier than using the buttons on the screen.
The same problem 
Ctrl+z works fine for me in windows
when you use a tool for building an object with several steps all steps with the tool are undone
i.e.: select point tool create A,B,C then select polygon tool and create triangle ABC. Undo eliminates the triangle
Select polygon tool and create a triangle. Undo eliminates the triangle and vertexes
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