I'd look at the atlassian-bamboo.log file, which is located in <BambooHome>/logs immediately after reproducing the issue - most likely this will show you what underlying error occurs and that might give you an idea of where to look.
Premier Support Engineer
I'm happy to announce that Bamboo 7.1 has been released and it’s overflowing with awesome new features. Top-voted issues First and foremost, a bunch of JAC top voted issues has been delivered - y...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events