Wait...wasn't there just a release? Well, yes. Unfortunately, the most recent version of both netCDF-Java and the THREDDS Data Server, v4.6.7 (released last week - 2017-01-03) shipped with a major bug related to reading NCEP GRIB2 tables, and that bug has been fixed in this release. This release also addresses an issue with the new GeoCSV output option in NCSS, as well as a bug related to NcML aggregations of unsigned variables.
For more information, including bug fixes and download links, please see the full announcement on the Unidata THREDDS github release page: