Render Farm stalling

I built a small render farm at my office (using all identical machines and version of Blender) started a network render using my own computer as both the client and master. (internal render engine) clicked on animate over network and then about 5 frames rendered very quickly and then the whole process stalled and stopped. I checked the 'Open Master Monitor option" and it said the other 534 frames of my render were queued (and they stayed queued for a very long time) even though the first 5 went through no problem. Does anyone have any ideas what might be causing this process to stop?
Thank you,

Mac Based Render farm (all machines are big and fast) Blender 2.69RC1