Morning all
Unfortunately no 1 seems to know the correct fix for this 
This morning i reinstalled Knime (using same workflow location)… and the fault was still present.
I then deleted the metadata folder from my original workflow location and that seems to have fixed it.
So the concern wasnt project related - somehow by adding a sharepoint link into the List Files corrupted the data within the main Knime workflow metadata folder.
Strange - but fixed for now.