I just tried this:

1. Create a sphere1 and make a copy sphere2
2. Change radius of sphere2
3. Apply Lab modifier to sphere1
4. Create a polymesh input and pick sphere2
5. plug vertices and polygons directly from the poly input to a new polymesh which then plugs into the output

So far, things work fine; sphere1 looks like sphere2
But if you now animate the radius of sphere2, sphere1 isn't updating!

What am I missing? Bug?

Martin