If you have color-approval tasks prior to the Creative Workflow 9.1 upgrade, the elements are locked down with the color target prior to the upgrade. For such task elements, the color conversion is not taking place because the previous color target is still assigned and does not access the proper light sources that are now on the server side. In other words, those color-approval tasks are not valid because you cannot view color-accurate contents anymore.
After Administrators update the color targets in the Color Target Manager on the InSite Creative Workflow server, you need to re-create new color-approval tasks.