Forum not keeping users logged in and auto-complete not working in Search for usernam

[Urinemachine]

Hey all -

I run a forum, http://www.new-sweden.com/forum and have this annoying issue. 1) If I log in, save password, etc., and not log out, when I come back to my forum in short time I need to log back in! Frustrating especially when performing maintenance. Secondly, when I go to Advanced Search and type in a user name (Or if trying to create a Private Message), I might start typing "Mult..." I have a user named "Multiplex" it simply WILL NOT complete the name. This is frustrating because I know the first few letters of user names and its supposed to populate.

Whats going on!?