On multisite it's not working for me

Hi,

I just installed a new wordpress 3.5.1 in multisite mode. The only plugin installed on it is the Avatars.

I registered a new user. This user not a blog owner, can't do anything just to write comments and modify its own data.

When i go to the "Your Avatar" page, select a file and upload it, then the Crop Image page is appeared, but the image on it is broken. The image is on the right place and accessible.
The admin url is:
/wp-admin/user/profile.php?page=user-avatar&action=upload_process
but the file url is:
../wp-content/uploads/avatars/user/c81/image.jpg
because of that, the image url will be:
/wp-admin/wp-content/uploads/avatars/user/c81/image.jpg
The directories rights are ok, because the image is uploaded and I can find it under:
/wp-content/uploads/avatars/user/c81/image.jpg
That is my first problem.

Second, when I clicked on the Crop image button, i was sent to this page:
/wp-admin/profile.php?page=user-avatar&updated=true&updatedmsg=Avatar+updated.
where i get a message:
"You attempted to access the "WP Test" dashboard, but you do not currently have privileges on this site. If you believe you should be able to access the "WP Test" dashboard, please contact your network administrator."

This with a freshly installed 3.5.1 wp.

The wp_usermeta table contains this, about that user:
+----------+---------+----------------------+------------+
| umeta_id | user_id | meta_key | meta_value |
+----------+---------+----------------------+------------+
| 17 | 2 | first_name | |
| 18 | 2 | last_name | |
| 19 | 2 | nickname | kate |
| 20 | 2 | description | |
| 21 | 2 | rich_editing | true |
| 22 | 2 | comment_shortcuts | false |
| 23 | 2 | admin_color | fresh |
| 24 | 2 | use_ssl | 0 |
| 25 | 2 | show_admin_bar_front | true |
| 29 | 2 | yim | |
| 30 | 2 | jabber | |
| 28 | 2 | aim | |
+----------+---------+----------------------+------------+

Please help!
Thanks!
Kate