Due to an error in the GO ontology publishing pipeline, the following releases of the ontology accidentally omitted all relationship tags:
The problem has been fixed in the 2014-10-17 release. In addition, additional verification steps have been added to the automated release pipeline.
The ontology can be downloaded here: http://geneontology.org/page/download-ontology. Note that it may take a day for fixes to percolate to AmiGO.
Apologies for any downstream issues caused