Since upgrading to revision 689, I'm getting a unsupported sort-order message and, presumably caused by the empty sorting string, a failed SQL select. The XBox request upnp:class, which seems to be commented out in the latest fuppes version.
I uncommented it, and it seems to work as usual. Then again, it was probably commented out for a reason, which is why I'm posting this.
Also, I was somehow expecting fuppes to just ignore the sort order, if it is not supported. Error handling seems to be dodgy in that part (especially since dc:title was also requested, and that wasn't commented out).