I tested emacs-snapshot-gtk version 20061201-1, and it doesn't cause this problem any more. I suspect this bug was related to the following posting, but I am not sure.
http://lists.gnu.org/archive/html/emacs-pretest-bug/2006-11/msg00427.html At any rate, I think this bug can be closed. Thanks. Jae-hyeon -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]