We cannot assign resources using the Resource Manager.
The resource data needed to be sent to the Legacy Availability section applet correctly. Moving forward, several issues were fixed in the Legacy Availability section. One issue prohibited loading when there was resource data, while another issue caused the assignment of a resource to a task to fail and spin indefinitely.
[Admin: This post is related to the 01.27.16 post about being unable to access the TRIRIGA Gantt chart in Resource Manager.]