Yes, the month names did not appear in the problematic WP installation. It did, however, with the other one.
The PHP version is 4.3.11.
Hi Viper007Bond, thanks for the assist. I did what you recommended; I looked in the edit.php and edit-form-advanced.php. The code you quoted doesn’t appear.
Also, I have another WP 1.5.2 site (also upgraded from WP 1.5) on another server and this problem does not occur at all.
Strange.