Problem with image on the sub-store ?

Hi !

I use Marketpress with New Blog Template and I have a problem. My pictures are not corectly load on my sub-store.
For exemple : wp-content/uploads/2012/08/image.jpg on my main website
become /wp-content/blogs.dir/20/files/2012/08/image.jpg on my substore, so there isn't any image (for articles, pages and products)...

Is this a problem with New blog template or something else ?

Sincerly,