Matt, thanks for your suggestions. I turned off each and every conduit, it still resets with each synch! Any further suggestions appreciated.
I will try to do some experimentation, like backing everything up, doing a hard reset and restore, and see if it still does this. I should also try creating a new user and change the username on my Treo (there is an undocument way of doing this: On the Treo in the Memo application, open a new memo, create an 'upside down fish' by typing "s" and then push the alt key and select the shape that looks like an upside down fish; then type a period, then type a "5" ...believe it or not as soon as you do this, the username is reset to nothing!