For instance 10.6084/m9.figshare.979190 reported by Michael Crusoe. JavaScript parser didn't like @data entries produced by figshare and when requesting the entry dx.doi.org returns a 403 response for type accept type text/bibliography, also allowing application/x-bibtex fixes this. Interestingly dx.doi.org throws 500 exceptions if application/x-bibtex is the only acceptable type or appears first for some other DOIs.