I have managed to get flocking working to the point that a local job is picked up by a remote condor server (collector?) and the job is matched to an available client. However that is as far as it gets, the job doesn't actually run. All the systems involved are running linux. The local system is using condor 6.6.10; the remote system and the execution client is running condor 6.7.6.
The above looks similar to this: https://lists.cs.wisc.edu/archive/condor-users/pre-2004-June/msg00672.shtml
HTH, -John