No idea why it is working for some ...
maybe someone installed an extra codec on the bm5, or is Twonky making a difference ?
Carolpa said earlier in a post :
"There is probably a difference with the most other users. I use Twonky 7.01 on a Ubuntu server (and not the 6.0.3x version)! For the insider; Twonky doesn't transcode the Apple Lossless file!"
Carolpa, did you select the ALAC file with twonky or did you select it on the BS5 screen ?
nico