We reviewed the log file you provided. During that time, RatesOperatingModeDistributionGenerator is performing one time analysis of drive cycles. It is most certainly not "idle"!
From the log:
10/8/14 5:57 AM INFO: newSBDG setupTime=0 bundleTime=12652
10/8/14 6:26 AM DEBUG: ROMD calculateOpModeFractions processID=1
10/8/14 6:29 AM INFO: ROMDG setupTime=1719045 bundleTime=197668
The time gap between the SourceBinDistributionGenerator and RatesOperatingModeDistributionGenerator corresponds to the ROMDG setupTime of 171905 milliseconds (28.6 minutes) plus time for one per-bundle data of 197668 milliseconds (3.3 minutes).