I've exported a *.bip file from Alibre as I've done many times before.
When I open it in Kv4 there's nothing there - nothing in the scene display - no model in the scene tree - zilch!
However, when I open it in Kv3 it's there as expected.
What could be going on here...?
We have an update coming shortly that may address this issue. Contact info@luxion.com if you would like to try the new build.