When changing WPLANG to es_ES, I loose admin access to the Dashboard.

Hello all,

I Had WP 2.7. I upgraded to WordPress 2.7-es_ES (It just prompted on the dashboard). I made all my backups.

After updating, when logging in as Admin, I get

“You do not have sufficient permissions to access this page.” (In spanish).

If I go to wp-config.php and comment out define ('WPLANG', 'es_ES'); I can login correctly.

I’ve read most threads about this specific error, but they all point to having changed the table prefixes in the SQL, while I haven’t done that.

What could this be? I was expecting not to use force_update.php or anything that would keep me in the dark as for the fix.

Thank you very much.

Information:
What was I doing…
1- I recently translated Shopp plugin, and uploaded an Shopp-es_ES.mo to its directory.
2- I’m using a 3rd party .mo file for the WP language. However, it worked perfectly until the update, and would be very strange if a .mo file was making this error happen.
3- Before I upgraded, I made a WP-Backup and phpMyAdmin backup.
4- MAYBE IMPORTANT. I was having problems with the PHP memory allocation limit. Since I use shared hosting, the only way to increase it was changing from the PHP5 Engine to FastCGI PHP5, which provided me with a php.ini file. I changed max limit from 32 to 64MB.

Maybe because I was using define (‘WPLANG’, ‘es_ES’); WordPress recommended a spanish version, which is WP v.2.7-es_ES.