This complex profile is going transparent. if I go to another complex profile the full wall is visible again. Nevertheless the complex profiles don't show up. This is the case for the entire building!!!
@2raarchitecture The chequer pattern is related to a missing surface texture. It looks like somewhere during Hotlinking or import your complex profile has picked up unavailable or inappropriate surface references. This may also be complicated by the profile using surface overrides to the boundary of the various fills used for Building Materials in the complex profile definition. I would start by opening the complex profile and checking each used building material surface reference and any possible overrides.
Apple iMac macOS Monterey / AC26UKI (most recent builds)