I am having the same issue with SketchUp 2013.

Ruby console reports the following when spray on horizontal is clicked.

@unknownuser said:

Error: #<Errno::EACCES: Permission denied - C:/Program Files (x86)/SketchUp/SketchUp 2013/Plugins/CompoSpray/csSettings.html>
(eval):373:in initialize' (eval):373:in new'
(eval):373:in write_cs_dialog' (eval):111:in compoSpray_main'
C:/Program Files (x86)/SketchUp/SketchUp 2013/Plugins/compoSprayToolbar.rb:17
(eval):373:in `call'
(eval):373

Which is odd as it is the only plugin to which this happens. Any ideas?

.......Changing permisions for the "CompoSpray" folder in Plugins directory using Windows Explorer "properties" is a good place to start! Just answered my own question.

Thanks very much indeed for these, Paul.
They are just what I have been looking for.

Will be very useful and are very much appreciated.

Thanks, again.