While upgrading to Mysql5.0, the calendars stopped
working.  The error message was:
<pre>javax.servlet.ServletException: DecorationTag:
 _setGroupMenuItems threw SQLException: Cannot convert value 
'2007-03-02 14:09:58' from column 3(2007-03-02 14:09:58 ) to DATE.
 caused by: javax.servlet.ServletException: _setGroupMenuItems
 threw SQLException: Cannot convert value '2007-03-02 
14:09:58' from column 3(2007-03-02 14:09:58 ) to DATE.
	at gsrc.layout.Layout.decoratePage(Layout.java:201)
	at gsrc.layout.Layout.decoratePage(Layout.java:130)
</pre>The solution was to update <a href="http://embedded.eecs.berkeley.edu/dopsysadmin/faq/71.html">the MySQL connector</a>.