We have temporarily stopped the queues for TestFlight to allow them to drain so that we may upgrade TF machines to a new stack based on RHEL 6.3. Once all machines have been upgraded, we will re-enable the queues for jobs to test the suitability of this new stack.
Should there be no major software issues, this will become the de facto OS for RHEL6 based clusters on the next maintenance day, scheduled for January 17, 2013.