Files created with emacs are owned by system

[iainb . forms]

Hi,

I'm running Emacs on OSX 10.4 in Terminal. Every time I create a new
file using C-x C-f the owner is "system" and not my user, so the files
become read-only! I'm not running with sudo or su, so I'm not quite
sure why this is happening.

I'd like emacs to automatically save the files under my user account.
Any help with this is much appreciated.

Thanks
Iain