When viewing workflow timing diagrams for two completed workflows, the color-coding appears to be different when hovering over the same processes and steps. Both of the workflows completed and ran successfully, so I would not expect different colors.
Example 1: Workspaces>broad-firecloud-workshops/benchmarking-preemption>Monitor>January 11, 2017 2:51 PM>BRCA-A8-A09T-TP-NB (pair)>Workflow Timing>CallingGroup_Workflow.CallSomaticMutations: Running Job is Blue. Updating Job Store is Green.
Example 2: Workspaces>broad-firecloud-workshops/benchmarking-preemption>Monitor>January 11, 2017 2:51 PM>BRCA-B6-A402-TP-NB (pair)>Workflow Timing>CallingGroup_Workflow.CallSomaticMutations: Running Job is Green. Updating Job Store is Darker Green.
Example 1: BRCA-A8-A09T-TP-NB: Running Job = Blue
Example 2: BRCA-B6-A402-TP-NB: Running Job = Green