Post and old page permalinks work, new page permalinks don’t

Okay, here’s a weird one. Site is setup for nice permalinks (day and name), but is primarily pages, so that they’re all just essentially /%postname%

However, I’ve just tried to add a new page (first in a while) and when I put in the permalink URL for the new page it 404s. The .htaccess is correct, because the old pages resolve fine. And if I were to create a new POST, then THAT resolves fine. But any new page 404s. In fact, if I turn off the permalinks and go back to just ?page_id=60 when trying to access the page in question, it works. Turn permalinks back on (with .htaccess writable) and 404 again.

I thought something might have gotten hosed in WordPress, so I did an upgrade to 2.7.1 from 2.7 in the hopes that might fix it, but no. And considering the .htaccess is correct (see below), I’m thinking an internal rewrite within WordPress might be the culprit.

1. Any ideas on what might be causing this?
2. Is there just a brute force Rewrite I can use in .htaccess to make this work, as beating my head against this has caved in my forehead and I’m less interested in fixing the root cause than just having a page that works. Gah.

Thanks in advance.

.htaccess:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress