punBB 1.2 beta : bug install with MySQL

I have downloaded the beta from dec 02 , and installed it as the manual say.

After I complete filling the form of install.php, I got this error :

An error occured on line 1240 in file /home.nfs/shadowfr/www/forum/install.php.
PunBB reported: Unable to create indexes. Please check your configuration and try again.
Database reported: Access denied for user: 'shadowfr@%' to database 'shadowfr' (Errno: 1044)

If I try again, then I got this one:

An error occured on line 410 in file /home.nfs/shadowfr/www/forum/install.php.
PunBB reported: Unable to create table punbb_bans. Please check your settings and try again.
Database reported: Table 'punbb_bans' already exists (Errno: 1050)

The tables are created (17 tables) at the first try.

My host is www.ovh.com, the PHP config http://300gp.ovh.net/test.php , the Apache Modules http://300gp.ovh.net/infos/apache.cgi . The database is MySQL 4 (4.0 I think, not sure).

I've told punBB install script to use the mysql 3.2/4.0 database, to use punbb_ table prefix, and I've double check everything else (others scripts, from Phorum to IPB and Textpattern, SPIP and others work without troubles).

It's a beta bug ? It's a problem with my host ?

Just to be sure I just installed punBB 1.1.5 on the same host, same parameters : no troubles.