Quote Originally Posted by tamutka
the option Update repeating objects does not work as it should.
  1. Create, then position your items that you want to be repeating objects.
  2. 'Copy' (Ctrl+C), then 'Paste in place' (Ctrl+Shift+V) at any alternative target pages.
  3. After making changes to a repeating object, you can update all instances (on other pages) by simply doing an 'Arrange > Update repeating objects'.

As an alternative to step 2 above,
Quote Originally Posted by Xara Xtreme 5 Help
If you use the Repeat on all pages menu option described above this automatically creates an appropriate Repeating:AutoRepeat name and applies it to all copies, so from this point on it will be updated when you select 'Update repeating objects'
Also,
Quote Originally Posted by Xara Xtreme 5 Help
Update repeating objects only copies the repeating object to those pages that already have it.