Window border style does not change normally in Xubuntu

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http://askubuntu.com – yesterday I installed Xubuntu desktop on Ubuntu and it worked perfectly. Now, after PC restart, whatever theme I choose, changes just window border color, not all the style, for example, mine look like this: http://img151.imageshack.us/img151/9515/screenshot2012051211463.png instead like this: http://tuksik.ru/wp-content/uploads/2011/04/xubuntu_11.04_theme.png I tried to change theme, but it happens with all themes. By the way, sorry for my English. (HowTos)