Hi TIG,

Great plugin, but I'm having a bit of a trouble getting Composite C of G to work. It is probably just user error!

I select two previously made CofG groups (different group names, same density). I get no errors, but no Composite C of G either. Ruby console has the following:

Error: #<NoMethodError: undefined method entities' for nil:NilClass> /Library/Application Support/Google SketchUp 8/SketchUp/Plugins/CofGravity.rb:649:in do_composite'
/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/CofGravity.rb:116:in initialize' /Library/Application Support/Google SketchUp 8/SketchUp/Plugins/CofGravity.rb:816:in new'
/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/CofGravity.rb:816
/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/CofGravity.rb:649:in `call'
/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/CofGravity.rb:649

I'm on a MacBook Pro running 10.7 using SketchUp 8 and CofG v 1.6. I'm also in the process of learning Ruby, but am as yet a novice, especially Ruby with SketchUp.

I know you have probably moved on to other things by now, but a hint on any changes would be great!
thanks,
mark