Ok, I just began casting via Chromecast with Dsub 5.1.6 on a Galaxy S3. Is there a certain setting I'm missing that allows Dsub to cache while playing the songs like it normally does via bluetooth? I disconnected from chromecast and played the songs and it began caching the songs. I did look throughout the Dsub forum, but the only related post was re: DSub 4.8.6: 12/27/14 stating "Fix caching not working while casting"
http://forum.subsonic.org/forum/viewtopic.php?f=16&t=11549&p=53399&hilit=chromecast+caching#p53399