So when I make a new object in editor, sometimes my work are disapiring after I used shotrcut to undo (ctrl- z), after that reundo doesn't working and i must start over again.

I think it was already discussed here:
https://www.lexaloffle.com/bbs/?tid=744

it's not exacly this same problem, but maybe they are connected. In my situation whole object is gone after I used shortcut ctrl-z.

Yeh that happens to me too.
If I want to undo a small change, it deletes everything. And I can't get it back!

I think that only happens when you are using the box tool, and I can confirm this has happened to me too (win7 64bit). File a bug report?

Losing work really stinks -- sorry about that. I'm fixing the other undo bug for 0.1.7, but are you sure it's not the same one? (related to resizing). Otherwise, let me know if there is a way to reproduce it.

im sure it isn't raletade to resizing becouse i not using that whenn i working in editor

I find another bug in editor. Whenn i build in model editor and i had chosen a build voxel tool and use a shortcut ctrl+a to select all voxel, game imidiatly closes.

I know it sucks, whenever I undo, I can't redo, it says, "Nothing To Redo". They haven't fixed it yet, I have the same problem. =(