I did a blastx against uniprot_sprot.fasta (which should be a subset of uniprot, I think). When I uploaded this text blastx xml, the interface displays everything very nicely; however, the first column with linkouts to uniprot doesn't work (the uniprot id being sent to doesn't exist).
eg: http://afterparty.bio.ed.ac.uk/contig/show/37240648 - Blast Hits