For something that promised so much, Subsonic is turning out to be a dud...and an expensive dud too, given that you are required to pay for a year's subscription up-front.
I've had problems importing m3u playlists and now I've discovered a number of albums that are incomplete on Subsonic, but are complete in iTunes. I purchased an album from iTunes this morning with 3 discs and 82 tracks. After adding it to Subsonic I have the first 70 tracks missing.
I'm most likely going to call it a day as far as Subsonic goes...what a shame