Hi,
Are you allowing to use for end users Default Agent which is located on Bamboo host?
I must admit that I have doubts because I have to monitor all the time utilization of drive where bamboo-home is located (I will do it no matter what). One time even happened that build which was started by user use entire free space on drive so Bamboo crashed. Right now I'm monitoring it but when entire organization will start using Bamboo I think I will disable default agent because I could not be able to react fast in case of troubles and Bamboo will crash again.
How do you have on your installation?