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More than it.
Saving a (readonly) = (Re Done Ly) lvl may cause a crash = You can easily get it by overwriting the same lvl file many times by making minor changes for debugging stuff and so on screen for screen. Adding and deleting objects here and there. Change their position and so on. The level editor will 100% show you what you can't see in the game while testing it by using Alt+Tab to oddworld process 
I never shutdown oddworld for a minor screen change, like replacing a cam with a bitmap and then deleting and adding objects and so on. For debugging. And then when i get bored. I lose interest. = The lvl file got corrupted by pauls editor
So overwriting a lvl that is in use will cause the lvl file to get corrupted and no undo
and maybe the same if i do everything offline |
I've fixed the read only issue. Use the newest version and you won't have those problems. Obviously you can't save a file that's locked by another process. The editor will handle that as best it can now (saving to a temp file and telling you about it).
Edit: You should try to be more clear when explaining a bug, your post is extremely hard to understand