Pioneer has posted an firmware update for the DVR-110.
It adds support for new media and improves the burning quality.
To download the files:
http://wwwbsc.pioneer.co.jp
Be careful to properly select 100 or 110D depending on your model. Downloaded files are .exe but are in fact auto extractible zipped file (you can unzip them without any problem on Macs)
Then you can flash your drive as we have mentioned it already many times. If you are not in hurry, a region-free firmware of this new firmware update should be available soon.