May be a typo in the code of ver 2.0 or what???
Table wp_categories in ver 2.0 has a field category_nicename. In ver 1.5 the same field was category_nickname. (see categories.php)
Same is true with table wp_users (user_nicename instead of user_nickname)
Plugins which use this field (e.g. EventCalendar) give an error when used in ver 2.0. When nickname is changed to nicename in the plugin code, everything works fine.
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