While browsing a Build Log via the Connector, the folllowing Exception occured. Though the timing rather let me assume that some background task did cause this error.
Might be related to which occurred to me, too.
connector version: 1.3.7-20121120-1002
Visual Studio version: 10.0, Premium
Operating System: Microsoft Windows NT 5.1.2600 Service Pack 3
CPU count: 2
Atlassian Bamboo version 3.3.2 build 2718