I've recently updated to Drupal 6.13 and moved to Related Items 6.x-1.x-dev (previously I had been using one of earlier dev versions of this module). Now when I try to add new related item to one of my stories the autocomplete feature does not work so I'm unable to locate related stories. Even when i manually enter related story title and hit "Save" nothing is added and Related Items form reverts itself to the default state (it lists no related items and displays only "Add related" link).

Tested on Firefox 3.5 and Safari 4 for Windows. Any ideas what's wrong?