Structure Module: Weblogs not being recognized

I’m using the Structure Module, and I want to set up a listing page, but it’s no longer recognizing my News weblog. Here’s what I’ve got:

I originally had 4 weblogs: pages, news, events, and schools. I was able to set up a News listing page and a Schools listing page. I decided I didn’t need the events weblog, so I deleted it. Now, the News listing page has reverted to a regular page and I get the message “There are no available weblogs. Please create another weblog to make this page a listing page.” As a result, in the Structure panel, all my news items are getting listed in the top level.

I’m using EE Core 1.6.5 20081031. I added the lang.pages.php file. Other extensions:

jQuery for the Control Panel (v.1.1.1) Textile Editor Helper (TEH) (v.1.1.0) LG Add Sitename (v.1.2.0) LG Image Preview (v.1.0.0) Structure Extension (v.1.0)

Any advice?