Ian,
Did you change something in the board permissions? I used to have the ability to delete my own posts. Right now there is a double post by me in this thread and I can't delete one of them. I don't get the check box to delete it when I edit it.

http://www.xterraownersclub.com/cgi-local/ultimatebb.cgi?ubb=get_topic;f=73;t=000649

I disabled it temporarily.
I removed the duplicate in question.