It seems that disabling the 'Spawn Default Blueprint Nodes' editor preference results in control rig blueprints being created with event graphs rather than rig graphs. It doesn't appear to be possible to then create a rig graph so any users that have this option disabled will be blocked from using control rig. This effects both 4.26 and ue5/main.

Steps to Reproduce
  1. Open the editor preferences and disable 'Spawn Default Blueprint Nodes'
  2. Create a new control rig bp and open it
    1. Note how you're presented with a Event Graph rather than a Rig Graph

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ComponentUE - Anim - Rigging - Control Rig
Affects Versions4.26.1
Target Fix5.0-m7
Fix Commit16620463
Main Commit16620463
CreatedJun 7, 2021
ResolvedJun 10, 2021
UpdatedJun 28, 2021