PFTW: Make or Promote Subtask Sometimes Grayed Out and Sometimes Not: Please Help!

I have two separate projects that were created in PFTW. One of them I can still make and promote subtasks (not grayed out) and the other project I was able to make and promote subtasks but now both options are grayed out. I have tried to do this from Project Accelerator, PFTW, and Planner and cannot do it from any of the apps. 

This is the image from the Planner access for the WBS without the functionality accessible:

Here's a screenshot from the WBS where I can access:

I am not the only one with this issue and we seem to have the correct licensing as we can access the functionality in some projects but not in others.

Any assistance with troubleshooting and resolving this issue is greatly appreciated!