Post content and comments not rendering (WP 1.5.2)

My WordPress 1.5.2 blog suddenly stopped rendering the post content (storycontent is the class) and all comments. Each of the individual pages is still there: home, category, individual post), and the URL works, post title, timestamp, author, and categories display. But no content. RSS feed has the same problem.

Blog is https://pencoyd.com/clock/

I didn’t change any settings. All I’ve done for months is post – no tweaks to the CSS files, plugins, etc.

No data has been lost (phew!), as I can view the body of the post via the editing interface.

I don’t know when exactly it happened, but it seems like the problem may have started with post ID 1000. (I’m pretty sure, but cannot 100% confirm.) I posted again to see if post 1001 would work. Same thing:
https://www.pencoyd.com/clock/2006/04/20/clock-is-broken-working-on-it/

I wonder if I’ve triggered some strange limit? My host is Textdrive, and I don’t know of any limits on the rows in a table, and it’s not that big a blog.

Anybody have ideas about what to look at?