These are the steps I took to edit nurbs in workspace. Both modelspace and workspace 3d views must be visible:
- right click the nurbs cage button and choose workspace mode if needed
left click to activate the cage
exit pe mode, switch to workspace and edit the cage. be careful not to edit the nurbs geometry.
Press the "sync now" button of the Bridge Synchronize script to update the modelspace cage/nurbs
To update workspace nurbs press the Cycle bridge button of the synchronize script. Click the "Sync from modeler" button