I have been running WordPress for over two years now but haven't faced such situation before. I run one multi-author blog (with regular WordPress install) where users are free to register and blog. It's running well now. But recently I got a problem. A user reported that he was unable to update "Website" field in his profile. I looked into the issue and discovered that it was real. After changing the website URL in the website field, I click Update at the bottom and a message says that user profile is updated. But no change in the website field, not even if I keep it blank before updating.
I then logged into my database using PHPMyAdmin and there I changed his URL from wp_users table. After updating, it shows that the data is updated. However, the same old thing remains in the WordPress and the user in fact is not updated.
I tried this thing in many other users profile and they all worked. Just this particular user's profile is making the problem. Do you have any idea how to get it fixed? Please help. It's very important for our reputation. :(