That happens with the ZRS library teeth because they are digitally signed or something, so you can’t save them. That shouldn’t happen with the exocad generic library though. I’d have to take a look at your scene file. Can you Dropbox that to me and I’ll take a look?
The output save seems to be a tooth library thing. The proximal intersection thing I fixed by hitting cahin mode before moving on. If I ignore the proximal warning, I assume the teeth will not be correctable later….