Several but not all of our build definitions fail with the following message after upgrading from 4.0.1 to 4.1.1 today.
java.lang.NoSuchMethodError : com.atlassian.bamboo.ssh.ProxyConnectionDataBuilder.withRemotePathMapping(Ljava/lang/String;Ljava/lang/String;)Lcom/atlassian/bamboo/ssh/ProxyConnectionDataBuilder;