2 errors

hey folks,
Brand new installation, not an upgrade.
Wordpress v 2.1.3
PHP v 4.3.11
MySQL v 4.0.27-standard
created a db and a user on the server, (using cpanel…)
copied the extracted WP files to the server, and edited the wp-config.php file
I can connect, as the admin. There was an error on the blank main page, the default welcome post, but that was cleared up when I made a post. The error I have, when I am in the admin panel>Users>Author & Users tab:
Fatal error: Unsupported operand types in /home/foldernamehere/public_html/blog/wp-admin/users.php on line 55

I’ve deleted the wordpress folder, deleted the database and user. Created them anew, using different names. I did this 4 times to be certain it was repeatable. Exactly the same error. Once it’s an anomaly, twice it’s a coincidence, three times it’s a pattern…

Any idea on what I am doing wrong?
Thanks !
RV