Hi David,

Thanks you so much for your reply. My development environment is snow 
leopard and then  I deploy to a ubuntu server. To be honest I'm just 
trialling stuff at moment but strangely ran into problems  getting 
things working on snow leopard.  I actually figured out what was going 
on but I will definitely be looking at your advice when it comes to 
deploying to ubuntu.

Basically I figured out that the problem was due where/how the gem is 
installed under RVM. I checked where the gem was installed which was

/Users/conor/.rvm/gems/ruby-1.9.2-p0/bundler/gems/PDFKit-652209d

I then ran the command recommended in the POST_INSTALL readme in tis 
directory

 export TO=`which pdfkit | sed 's:/pdfkit:/wkhtmltopdf:'` && pdfkit 
--install-wkhtmltopdf

which installed   wkhtmltopdf to

/Users/conor/.rvm/gems/ruby-1.9.2-p0/bin/wkhtmltopdf

I then set the configuration for PDFKit to point to this path in my 
application.rb

 #pdfkit
    config.middleware.use "PDFKit::Middleware"
    PDFKit.configure do |config|
        config.wkhtmltopdf = 
'/Users/conor/.rvm/gems/ruby-1.9.2-p0/bin/wkhtmltopdf'
    end

Everything seems to be working so far
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