When i write a post, in the upload section : browse all, it tries to browse images that was previously there. It start browsing in a folder that no longer exist (when i previously was using the date sorting option).
Now i use 'wp-content/uploads/images' for images, its notified in the options.
It's like WP don't refresh itself to the new URL.
(note that before this, i didn't tried to browse images as i was using some other method, the Xinha plugin that i finally don't use anymore, but anyway)