If any one not able to locate CFormsII admin menu then there mist be below mentioned points which needs to be taken care:
1) Conflict with another plugin.
2) Other admin User Interface managing plugins not considering cformsII.
3) Admin rights not properly set during plugin activation.
4) The web server is not delivering a properly defined $_SERVER array
5) It may either be a permissions problem or related to how websever handles URI strings in _SERVER.