Thread:Project:Support desk/There is no user by the name "foo". Check your spelling.

I've just set up a brand new site, initially with local users but now with users authenticated via ActiveDirectory. Somewhere along the way, one local user I had created for myself is now unmodifiable in the Special pages, e.g. if I try to set this user's preferences in Special:UserRights, I get There is no user by the name "foo". Check your spelling.

However, in MySQL, I can see this user in the user table, and all columns appear to be correct. I've checked and double-checked that the user_name in the table is the same one I'm entering on the site (while logged in as Admin).

What else can I check?

Using:
 * MediaWiki	1.20.5
 * PHP	5.3.3 (apache2handler)
 * MySQL	5.1.67

Installed Extensions:

Special pages
 * User Merge and Delete (Version 1.7)
 * Realnames (Version 0.3.1)
 * LDAP Authentication Plugin (Version 2.0c)