WordPress MU

Hi.
One of the blogs on the site started giving a no access-error when submitting comments about a day ago, and today all comments on that one blog are gone. Trying to submit a comment to a post now gives a 404 error, and the url shown ends with "/comment-page-/#comment-" where it should continue with the post title. The permalink is correct, but submitting a comment leads to an invalid url.
The other blogs on the same site are not affected.
I have a full database backup for the entire site for every 8 hours going a week back, just wondering if theres something I can try before resetting that blog.

Any ideas?

Are the comments still in the table? If they are not and you want them back then you'll have to do a restore.

I found out the problem was caused by a corrupted table in the database, found it exactly in the comments table for that one blog.
Restored from backup and seems to have solved the problem.
Thank you.