The search index could not be updated. The site is misconfigured. Contact an administrator. SQLSTATE[42000]: Syntax error or access violation: 1064 unknown table 'tiki_main_67e2559f7089d' in delete request
Then can change there friendly name through the user preferences screen, but the username i.e. login name is very hard to change without alot of database work. This is because Tiki uses the username to create record linking rather than a userid.
