Apologies if this has already been covered.
Something odd happening with vectron lights.
If you change the geometry type of a vectron light the link to all it's instances breaks.
Likewise, if you turn off then on the vectron tickbox, all instance links are break.
If you make an Octane light without the vectron option ticked then you can change anything and all the instances stay as instances.
It's only when you have the vectron option that things start to break.