For anyone reading this - there are a lot of useful documents and FAQs in this Forum that cover issues such as this one. On the main FormsCentral Forums page there is a list of popular FAQs and a link to "View complete list of FAQ's": Frequently Asked Questions
Here is the FAQ for Image does not show up in PDF
Thanks for the reply Josh! BTW I searched the forums before asking the question and must have over looked the correct FAQ. And yes the images I use in my forms are high quality print ready files. I will convert to RGB for FC from now on. Simple enough thanks!