Thought I'd share an experience from last night. I was trying to rip the 96 kHz/24 bit 2-channel blu-ray remaster of Dark Side of the Moon from the Immersion set last night. I ripped it the same way I've done all my other blu-ray rips (using DVD Audio Extractor). The DX100 has had no issues playing these files from other albums (unless it is the source of my random skipping issue, but aside from that, the DX100 plays the files). And the files always work perfectly in iTunes.
Well, for whatever reason, the ALACs from the 96 kHz/24 bit DSOTM will _not_ play on on the DX100. Attempting to play them crashes the music player. I ripped them again, same thing. I transcoded the ALAC to FLAC and they play perfectly. Thus my conclusion: the DX100 has very poor support for ALAC.