No sound on FLAC files

[savestheday]

Hi all,
Trying to figure out what happened here. I had previously been running fine for months. Didn't touch anything but can no longer play FLAC files from the web interface. Playing them in iSub works just fine. I thought it was an FFMPEG problem but there are no issues in the Subsonic log.

OS: unRAID (Slackware)
Subsonic: v4.7 (running from subsonic.sh)

It's really odd. Any help you guys can give me would be much appreciated. Thanks.