Hello All
I downloaded the Solid Inspector plugin on my Mac and it wasn't loading.. After some looking around I realized that I had put the plugin here:
/Applications/Google SketchUp 8/SketchUp.app/Contents/Plugins
Where it should have been put here:
/Library/Application Support/Google SketchUp 8/SketchUp/plugins/
Now it's working fine.
Hopefully that help some of the Mac users out there who are having issues..
Antony