Jenkins Slave Builds stall at 'Opening Scene'

I am trying to setup a system for CI of new builds. Currently, our iOS builds are done using Unity3d Pro on a Mac OSX server we have setup to run as a Jenkins slave (The Jenkins master is running on Linux platform).

I have no issues passing the command to the slave and starting the build from Jenkins, but the build seems to stall at a point of opening the scenes after it reaches "DisplayProgressbar: Building Player".

The execute shell command is running under an admin user on the Mac,...

Jenkins Slave Builds stall at 'Opening Scene'