Earlier I have blog in wordpressmu then after wordpress 3.0 version I decided to migrate to new version. I exported my all posts by using the wordpress export tool. Then I imported data into new wordpress installation. I got all my posts and category and all the data. Then I checked all my attachments. Then I saw my media library I saw all the images listing are there but images are not showing in media library. I personally faced this issue and that time I got very frustrated.

When I checked my database I saw the all the my attachments are listed in post table but images are not displaying. All the places I only saw the wp-includes/images/crystal/default.png image.
I did spend one hour googled for solving the issue but I did not found any solution for this. Than again I checked my Folder permissions and images files but I found all things are perfect.
Then I checked my database and I found the issue. in wp_posts table ->post_mime_type column one entry was missing. After seeing that issue I fixed the issue.
I used the following mysql quires using myphpadmin tool.
Update wp_posts set post_mime_type='image/jpg' WHERE guid like '%jpg%' Update wp_posts set post_mime_type='image/jepg' WHERE guid like '%jepg%' Update wp_posts set post_mime_type='image/png' WHERE guid like '%png%' Update wp_posts set post_mime_type='image/gif' WHERE guid like '%gif%'
After using above query I checked the my media library. I am able to see my all images in media library.
My advise to you is first take backup of your database and then use above mysql quires. Then use the above quries.
If you are imported post from other website then use following commands also.
UPDATE wp_posts SET post_content = REPLACE(post_content, 'NEW-DOMAIN-NAME', 'files/'); UPDATE wp_posts SET post_excerpt = REPLACE(post_excerpt, 'NEW-DOMAIN-NAME', 'OLD-DOMAIN-NAME'); UPDATE wp_posts SET guid = REPLACE(guid, 'NEW-DOMAIN-NAME', 'OLD-DOMAIN-NAME');
Above quires will change the domain location of file.

Media Library not displaying images after importing posts
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This is really a extremely interesting post, thank you for sharing! You will find many blogs on this topic but this one states precisely what I think as well.
did that and the problem wasn’t solved.
this function was normally worked about 1 year.
now when I try to upload new image on my post,image uploading normally, but on wordpress it’s not visible,please share your experiance.
The same problem appeared at my WordPress Media Library, I couldn’t see the images in the library (only wp-includes/images/crystal/default.png image) but the pictures do exist in the right folder and they are displayed in the posts as well.
This happened after the upgrade to WP 3.5.1. If I upload new pictures, it’s no problem, it only happens to the images I uploaded before the upgrade.
If I check the database, the post-mime-type for all images is: images/jpg . So your solution seems great but it’s not working for me… Any other suggestions? Thanks!