Access should retain the position of the tables in the relationship window.
Make sure you save before you exit the window.
It may also help to turn off Name AutoCorrect:
http://allenbrowne.com/bug-03.html
If you rename the tables, they may not hold position.
Some combinations of Access versions + Windows versions will mess up the
location of a table in the window if you are scrolled down or right when you
right-click the table in the Relationship Window to edit it.
Creating a new database and importing everything will also lose the
relationship layout.
Stephen Lebans has a utility that can save multiple Relationship Window
layouts:
http://www.lebans.com/saverelationshipview.htm
