Just wanted to quickly update you. I was attempting to render the view before I had initialised the renderer on the render thread on the first frame a new view was created, that's why the tree was null. I've fixed this up so it no longer does this, it now won't try to call IRenderer::Render / IRenderer::RenderOffscreen until we've called Init on the view and passed in the render device.

However, I'm guessing we had the same error in 2.2.6, it's just it didn't crash, I imagine it silently failed on the first frame.

Yes, we were silently failing before and we should keep doing the same now (to avoid crashes when clients create view with empty content), I will fix it. Thanks for reporting.