When you first open up the Imposer window the layout defaults to Registration OFF. You can turn it on and try to save it as a setting. For some reason the details always show registration off center even if you select center. The next time you run XPress and Imposer, registration will be off again. Very irritating, and expensive, if you happen to run a big job to film before realizing that the registration marks are not there!

Way back the same thing was happening, and then suddenly they "fixed" it... the registration ON setting was being retained. But now it's back to its old ways.