I just installed the new wordpress 3.4 from fresh. The previous WP 3.3 (upgraded from WPMU) had no access to the Network admin... anyway, that's not the problem.
I import XML files from the previous EXPORT (what a great tool !), and moved manually images on the server after I create each blog and upload a media (then I can have the correct folder created).
It's all working good except the fact that in my articles/posts images have relative URLs (like ../) instead of the complete URL; http://.
Also I don't see my medias in the dashboard/Medias but they are in the folder.
Any suggestions ? Thank you for your help