First of all let me say thank you mad_ady for all this great work!
I am testing 1.05.04 0.5.2.1 on a wired connection and I have experienced the following:
1) As others already reported, if network cable is unplugged, the unit will not boot (tested by chance, when the power supply of my switch failed

)
2) Going to WDTVExt, I am using MediaMark and it is working ok, but whenever I've tried to use MediaFolder, OSD crashed everytime I have entered Videos folder.
3) As expected OSD freezes after a while. The strange thing is that sometimes it freezes after just one movie (a couple of hours), but once (just once up to now, unfortunately

) it worked for a couple of days without the need of rebooting my Live.
Thanks a lot once more
Guido