Upgrading Drupal

When I upgrade the version 4.7b4 to 4.7b6.
It has appeared the
warning: Invalid argument supplied for foreach() in /home/consen/public_html/modules/upload.module line 432.
I have the upload, filemanager and Acidfree installed.
In other sites with same modules 4.7b6 is running well.
Can be any related to organic groups? It has disappeared the check button for public access.

I have cleaned the sessions table but without success.

thanks in advance
Ferran
CONSEN.org

I use drupal 4.6.6 with mysql4.0.26. Now, I want to use mysql 4.1.
I backup mysql database with mysqldump
When I restore database with mysql command. It's give me some errror message as:

I get this error in my logs when updating from 4.6.6 to 4.7RC1

Unknown column 'access' in 'field list' query: UPDATE users SET access = 1143923899 WHERE uid = 1 in /html/includes/database.mysql.inc on line 120.

I just upgraded from 4.6.6 to 4.7RC1. I noticed there is no xtemplate folder in the themes folder, without it all my themes that were dependant upon it don't work. When I add the xtemplate folder from 4.6.6 I get blank pages.

I'm trying to make a local copy of my website and I'm keep getting errors when trying to load the sql file to the local database:

Running update.php on my site, under ""Select versions"

system module:
No updates available

Is this just the behavior to expect when going from Beta6 to RC1 ?

Thanks,
Chris