Upgrade to MOOC v4.1
R43 and I43 won't plot the diagnostics buffers (reports 'no plot points'). Switching to the 'old' DPM solves the problem. Brian Hendricks believes the problem is due to the outdated version of MOOC running on the rrbpm and ibpm nodes (v4.0). Upgrading to v4.1 should solve the problem.