Same here : Cannot launch SweetHome 3D for monthes (since 5.3 release).
I did switch from a 2011 MacBook Air to a brand new MacBook Pro last month (macOS 10.12.6). I did reinstall SH3D (using homebrew cask), but the software remains locked on the splash screen.
I often search for an answer in those forums, I tried different fixes (no PlugIns folder in Package content folder, no log in my console, no extensions folder in ~/Library/Java), but nothing worked, even installing manually.
France
Joined: Nov 7, 2005
Post Count: 9426
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Re: Doesn's launch
Then, it was probably an issue with Java 3D that I updated to version 1.6 in the DMG in version 5.5.2. Thanks for your feedback
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Emmanuel Puybaret, Sweet Home 3D creator