I've upgraded my site to 7.14 and now when I try and resave an existing node I get the error on a node reference field:
node reference field name: this post can't be referenced
and it won't let me save any changed to the node.
I can create new nodes fine.
I'm not sure if the error was due to the drupal upgrade or a different module, I'm using Chaos tools 7.x-1.0.