General Menu -> Sidebars Manager -> New
No entries in table.  Click "New".  A page is displayed with only the entries:
Open All | Close All
Unable to create first sidebar.

All other menu entries work and have data (categories, styles, and languages ... was able to create new category and new style).

PHP Built on:       Windows NT WINDOWSDEV1 5.2 build 3790
Database Version:   5.0.67-community-nt
Database Collation: utf8_general_ci
PHP Version:        5.2.6
Web Server:        Microsoft-IIS/6.0
Web Server to PHP interface:    cgi-fcgi
Joomla! Version:    Joomla! 1.5.6 Production/Stable [ Vusani ] 12-August-2008 22:00 GMT