ForestIvy Limitations? ForestIvy objects not visible after opening the file

[3d-labor]

Hello,
at first: Forest Ivy is amazing! It is a big time saver. In my case I had very thin geometry. Usually for walls a lattice is used, made of thin wodden or steel bars. I noted, that this geometriy is not suitable for ForestIvy. When I used the groth setting the ivy vanished. So I used a trick. I made a big box behind the lattice and draw the ivy on that box.  That works and I got no warning of too much elements. But also after using the groth settings  the ivy vanished again. Please see my screenshots.
First is the ivy on the bars.
Second is the box behind the lattice.
Third shows that it worked, I was able to spread the ivy on all elements before it vanished

Are there limitations or what I do wrong?

[RealViz]

The auxiliary surface (your big box) must be maintained. You must not delete them, just put them in e.g. a non-render/hidden layer.

[3d-labor]

I did so, I didn´t delete the box. Only set it to non renderable. I will now try it with smaller boxes, one per lattice.

[3d-labor]

After some tries now it works. I think it was a beginner error, not a software limitation.