I have been testing 126.96.36.199 and 188.8.131.52 on a very minimal Xubuntu 12.04 installation on my netbook.
When using my E1.31 to DMX interface I have absolutely no problem - the system was up for 48 hours with 184.108.40.206 and 24 hours with 220.127.116.11 (but still running).
When I have a USB interface connected, I've been testing with a MagicDMX, MagicQ crashes very often.
I also had problems with previous versions of MagicQ on my nettop and an Enttec Pro (but as that's embedded in my flightcase I haven't been testing with it).
I've not seen the error you posted, though. The ones I've been seeing have been posted on the bug tracker.
I'd suggest raising a ticket there http://download.magicq.co.uk/
MagicQ Linux 18.104.22.168 with USB Audio Interface, Elo Touch Screen, Enttec Pro, 4-channel sACN to DMX interface and X-keys Pro in Hardware Mode