@anton_s said:

I need some people to test this on Mac OS X.

Hi, I would like to test on OSX.

Downloaded plugin, and copied to:
/Users/arturmaciag/Library/Application Support/SketchUp 2013/SketchUp/Plugins/
and
/Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/

In Sketchup 2013 after start:

Error Loading File /Users/arturmaciag/Library/Application Support/SketchUp 2013/SketchUp/Plugins/SketchyPhysics/main.rb
no such file to load -- /Users/arturmaciag/Library/Application Support/SketchUp 2013/SketchUp/Plugins/SketchyPhysics/lib/dl
Error Loading File SketchyPhysics.rb
no such file to load -- /Users/arturmaciag/Library/Application Support/SketchUp 2013/SketchUp/Plugins/SketchyPhysics/lib/dl

Ruby console is empty.

In Sketchup 2014 Make after start:

Error Loading File /Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/SketchyPhysics/main.rb
Error; #<RuntimeError; An error occurred while trying to load Ruby FFI!
cannot load such file -- /Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/SketchyPhysics/lib/2.0/ffi_c.so
/Applications/SketchUp 2014/SketchUp.app/Contents/Frameworks/Ruby.framework/Versions/2.0/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb;45;in `require'
/Applications/SketchUp 2014/SketchUp.app/Contents/Frameworks/Ruby.framework/Versions/2.0/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb;45;in `require'
/Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/SketchyPhysics/lib/ffi.rb;7;in `<top (required)>'>
/Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/SketchyPhysics/lib/ffi.rb;10;in `rescue in <top (required)>'
/Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/SketchyPhysics/lib/ffi.rb;6;in `<top (required)>'
/Applications/SketchUp 2014/SketchUp.app/Contents/Frameworks/Ruby.framework/Versions/2.0/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb;45;in `require'
/Applications/SketchUp 2014/SketchUp.app/Contents/Frameworks/Ruby.framework/Versions/2.0/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb;45;in `require'
/Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/SketchyPhysics/newton.rb;8;in `<top (required)>'
/Applications/SketchUp 2014/SketchUp.app/Contents/Frameworks/Ruby.framework/Versions/2.0/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb;45;in `require'
/Applications/SketchUp 2014/SketchUp.app/Contents/Frameworks/Ruby.framework/Versions/2.0/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb;45;in `require'
/Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/SketchyPhysics/main.rb;23;in `<top (required)>'
/Applications/SketchUp 2014/SketchUp.app/Contents/Resources/Content/Tools/extensions.rb;197;in `require'
/Applications/SketchUp 2014/SketchUp.app/Contents/Resources/Content/Tools/extensions.rb;197;in `load'
/Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/SketchyPhysics.rb;217;in `register_extension'
/Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/SketchyPhysics.rb;217;in `<module;MSketchyPhysics3>'
/Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/SketchyPhysics.rb;199;in `<top (required)>'

in Ruby console:

(eval);1; warning; already initialized constant Traductor;;SU_MAJOR_VERSION
/Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/Fredo6_!LibFredo6/Lib6Core.rb;40; warning; previous definition of SU_MAJOR_VERSION was here
(eval);1; warning; already initialized constant Traductor;;RUN_ON_MAC
/Users/arturmaciag/Library/Application Support/SketchUp 2014/SketchUp/Plugins/Fredo6_!LibFredo6/Lib6Core.rb;39; warning; previous definition of RUN_ON_MAC was here

MacBookPro 2013, OSX Yosemite (developer preview (i have also 10.9 Maverick on another machine - can test if that helps)).