UPDATE: The issue with goo.gl has been resolved. Goo.gl made changes to their API that required dlvr.it to update an API key. We updated the key as of Noon (Pacific) on 12/13/11. If you are using goo.gl as the shortener in dlvr.it, your items will be processed and posted.
As of 12/12/11 dlvr.it is encountering issues when attempting to shorten links for some users via Goo.gl. This issue results in dlvr.it not having a shortened goo.gl link to post -- so dlvr.it does not post the item.
The issue appears to be on Google's end. We are continuing to investigate.
In the meantime, you can set dlvr.it to use dlvr.it or bit.ly shortened links -- and posts will be made.