I can hear the green loop Jacaranda Shaker 01 through 04 when I play it in the loop browser. As soon as I add it to a new track it doesn't play. The track will show the midi notes in the Piano Roll but when playing the track I get nothing. Also since it's midi my keyboard should play the note but no sound from it either. IDEAS?

Assuming you're dropping them onto an Instrument track, the 4 Jacaranda Shaker loops should automatically load the "African Kit" patch from the Library, providing the sounds for playback and live MIDI keyboard playing. I noticed that the Sampler Instrument and samples in this patch are in the GarageBand library folder, so maybe if you don't have the full GB library installed that could be why they're not showing up -- it's worth a look (Library > Application Support > GarageBand > Instrument Library > Sampler)..