WP 3.0.4 Network Version Media Upload problem

Hi,

I have installed WP 3.0.4 Network(Multi-Site) and all functions are fine except Image(media) uploading to Sub-Sites.
Thumb images(sub-sites) are not shown on Media library.(main site’s media library is fine).
Images in Main Site(wp-comtent/uploads/) are fine, but the images in sub-sites(wp-content/blogs.dir/id/files/…) has problem.
File URL can not bring the image at all. If I change “/subsite name/…” on image file url to “wp-content/blogs.dir/site-id/files”, it works.

I just installed .htaccess file same with instruction.

Please HELP!!!