We initially wrote COCANWIKI because we wanted a wiki written in Objective CAML to handle the OCaml-related OCaml Alliance Network pages.
COCANWIKI is now a full content management system and knowledge sharing tool for teams. The company behind it is targeting ease of use for new users, and unique features like the calendar and mail systems.
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I'm not sure what the exact problem is. I'm now using /etc/init.d/apache stop; /etc/init.d/apache start to restart Apache (ie. I stop it completely and then start it).
Another problem you may find is that Apache is killed "mysteriously" overnight. The cause is that some overnight job, usually logrotate, tries to restart Apache, but instead ends up killing it. I've modified /etc/logrotate.d/apache so that the postrotate script does a full stop/start as above.