Hi @nico155bb, I let you know that some of the errors reported here (about slabs that disappear or walls not being generated properly) have been fixed in VisualARQ 3.4.3 which is already available to donwload.
You can read the full news here: VisualARQ 3 - Version 3.4.3 released
And download this version from the web: Update - VisualARQ
However, this particular case has not been solved yet. We are working on it: