Hi again,
After a bit of trawling I've decided it may be easier to revert back to an older firmware, one that I know works (albeit slowly).
A problem has been tracking down the link to the old firmware *.deb file, as the WD site links automatically to the newest firmware.
After a bit of trial and error, I found it.
For those who follow, the link (still working as of today) is:
http://download.wdc.com/nas/apnc-021012 ... 120308.debAs I've said, I had Serviio up and going on this older firmware, but performance was an issue which was why I tried updating.
If anyone has a suggestion as to why Serviio may be slow, please let me know.
Even when tracking the server starting up (via the tail command), it takes a really... really long time to even load up device profiles.
Still, kudos the the peeps who got it running on the MBL! It's the best option we have for running MKVs over DLNA - though slow starting up and navigating, there is no lag when streaming The Godfather, 20gig large... over wireless.
Edit: Though I could download this firmware, I got and 'invalid firmware package' result when I tried to revert. Balls. If anyone else has more luck let me know!