[Plugin: qTranslate] Categories suddenly disappeared

After making some slight changes in css file (.qtrans_language_chooser li { float:left; margin-left:10px; }) all my categories suddenly disappeared.
All post are now “Uncategorized” and I can’t see the list of categories in admin panel although on dashboard I can see that there’re 8 categories.
I can’t create these categories again as I got message that already exist.
What can be the problem?

http://wordpress.org/extend/plugins/qtranslate/