Not sure if this is part of the same concern, but I face similar problems: from "one day to another" within the last 5 days, SweetHome3D stopped working on my macOS (Catalina 10.15.4).
Looking into the error logs in the Console, I get these messages:
> SweetHome3D[9077]: SweetHome3D:Failed to ...
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- Wed May 13, 2020 11:20 am
- Forum: Installation
- Topic: Update in MacOSX stops it from working?
- Replies: 3
- Views: 8007