How resolve problem import / display / images path in the sub-domains

Hello,

Sorry my English is very bad , I use Google Translation

My current WP configuration
- WordPress Version : 3.6.1 .
- Version of PHP / MySQL 1.5.69 ( Server: Localhost via UNIX socket - Software Version: 1.5.69 )
- Web Server : Apache/2.2.15 (Version client database: libmysql - 01/05/69 )
- PhpMyAdmin 3.5.8.1
- Virtualmin / Webmin : 4.02.gpl (Sub -servers : 2 out of 10; Alias ??servers: 3 out of 10 )

- Theme used : Vantage 1.0.7 ; Showcase
- Extensions in place : Domain Mapping plugin Version 4.0.0 , Version 2.3 Meta Slider , Page Builder by SiteOrigin Version 1.3.6 , Version 1.6.2 Post Types Order ; WPMU DEV Version 3.3.2
- Name hoster : ESPACE2001
- My website: SITE971.COM

Problem (s) meet (s):

I can " add media " correctly since site971.com BUT not for subdomains : if the " add media " function any good images in my directory blogs.dir ( 777 ) WP side interface subdomain " directory " j ' get a " broken Image " icon : link = example http://annuaire.site971.com/test/

This bp appears in various post ... It seems to me that this is a path problem .
Here is my htaccess . Http://site971.com/?attachment_id=173
An excerpt from wp- config.php : http://site971.com/?attachment_id=174

Someone knows the solution ?

thank you ,
Eric