It's seems, I found a bug. Or maybe not, i'm not sure. Anyways, i want to have your attention about this.
I created a page called "a" (one letter). I wanted this page to look as "---" (three stripes) in menu, so i renamed it (i renamed only menu name, not page name). After a while I have deleted this page. And WB deleted not only this page, but whole "pages" directory. After that i couldn't reach any of my pages, because all configuration files of pages, which were in "pages" directory were lost.
I made this, because I am looking for a separator in menu. Three stipes (---) in some others CMS makes a separator, so I can make my menu easier to surf. This feature would be great in WB.