This bug appered when we started to use scenario level GivenStories keyword in our stories.
We use Hudson as CI with jenkins plugin for present reports. Probably, jbehave generates invalid xml, so exception occured(see StackTrace.txt in attachments) on post-build action "Publish testing tools result report".
I investigated generated xml and found some weird things:
1)missing "=" between attribute's name and value
2)strange string like
4)in two similar stories we have different xml